Display panel and display apparatus having the same

ABSTRACT

A display panel and a display apparatus including the display panel are provided. The display panel includes: a light transmitter disposed on a first pixel electrode and a light converting unit disposed on a second pixel electrode. A portion of the light converting unit extends toward the light transmitter and covers a part of the first pixel electrode.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority from Korean Patent Application No.10-2016-0137915, filed on Oct. 21, 2016 in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein byreference in its entirety.

BACKGROUND 1. Field

Methods and apparatuses consistent with exemplary embodiments relate toa display panel and a display apparatus having the display panel.

2. Related Art

A display apparatus is a type output device configured to convert andvisually display acquired or stored electronic information. Displayapparatuses are used in various places such as homes, workplaces, andthe like.

Multiple types of display apparatuses are capable of outputting an imageto the outside using different types of display units. For example, thedisplay unit may be a cathode ray tube (CRT), a liquid crystal display(LCD), a light emitting diode (LED), an organic light emitting diode(OLED), an active matrix OLED, electronic paper, or the like.

The display apparatuses may be used, for example, in a television,various audio/video systems, a computer monitor device, a navigationterminal device, various portable terminal devices, such as a notebookcomputer device, a smartphone, a tablet personal computer (PC), apersonal digital assistant (PDA), a cellular phone, or the like.Additionally, various display devices may be used in industrial fieldsto display still images or moving.

SUMMARY

Exemplary embodiments may address at least the above problems and/ordisadvantages and other disadvantages not described above. Also,exemplary embodiments are not required to overcome the disadvantagesdescribed above, and may not overcome any of the problems describedabove. Exemplary embodiments provide a display panel having furtherimproved color reproducibility to output an image with appropriatecolors, and a display apparatus including the display panel.

According to an aspect of an exemplary embodiment, there is provided adisplay panel including: a light transmitter disposed on a first pixelelectrode; and a light converting unit disposed on a second pixelelectrode. A portion of the light converting unit extends toward thelight transmitter and covers a part of the first pixel electrode.

The first pixel electrode may be a blue pixel electrode; and the secondpixel electrode may be a green pixel electrode.

The light transmitter may include: a light transmitting material; anddispersion particles distributed throughout the light transmittingmaterial.

The light transmitter may include: a dye configured to absorb lightother than blue light; and dispersion particles.

The light transmitter may include: a dye configured to absorb at leastone among red light and green light; and dispersion particles.

The light converting unit may include green light quantum dot particlesconfigured to convert light incident on the light converting unit intogreen-based light.

The portion of the light converting unit may be configured to convert aportion of blue light incident on the blue pixel electrode to greenlight, and light incident on the blue pixel electrode may be emitted asmixed blue light and green light.

A width of the portion of the light converting unit may be 1% to 25% ofa width of the first pixel electrode.

An area of the first pixel electrode covered by the light convertingunit may be in a range of 1% to 25% of an area of the first pixelelectrode.

The dispersion particles may include at least one among a zinc oxide, atitanium oxide, and a silicon oxide.

The light transmitting material may include at least one among a naturalresin, a synthetic resin, and a glass.

According to an aspect of another exemplary embodiment, there isprovided a display apparatus including: a display panel including: alight transmitter disposed on a first pixel electrode; and a lightconverting unit disposed on a second pixel electrode and the first pixelelectrode; and a light source configured to emit light toward thedisplay panel.

The first pixel electrode may be a blue pixel electrode; and the secondpixel electrode may be a green pixel electrode.

The light transmitter may include: a light transmitting material; anddispersion particles distributed throughout the light transmittingmaterial.

The light transmitter may include: a dye configured to absorb lightother than blue light; and dispersion particles.

The light transmitter may include: a dye configured to absorb at leastone among red light and green light; and dispersion particles.

The light converting unit may include green light quantum dot particlesconfigured to convert light incident on the light converting unit intogreen-based light.

A portion of the light converting unit disposed on the blue pixelelectrode may be configured to convert a portion of blue light incidenton the blue pixel electrode to green light, and light incident on theblue pixel electrode may be emitted as mixed blue light and green light.

A width a portion of the light converting unit disposed on the firstpixel electrode may be 1% to 25% of a width of the first pixelelectrode.

An area of the first pixel electrode covered by the light convertingunit may be in a range of 1% to 25%.

The display apparatus may further include a liquid crystal layer, andthe light transmitter and the light converting unit may be disposed onthe liquid crystal layer.

The light source may include a plurality of light emitting diodes, andthe light transmitter and the light converting unit may be disposed onthe plurality of light emitting diodes.

The light transmitter may be one of a plurality of light transmitters,the light converting unit may be one of a plurality of light convertingunits, and the plurality of light transmitters and the plurality oflight converting units may be arranged in a repeating pattern

According to an aspect of another exemplary embodiment, there isprovided a display panel including: a light transmitter disposed on afirst pixel electrode, the light transmitter including a plurality oflight converting particles configured to convert light incident on theplurality of light converting particles to a first color; and a firstlight converting unit disposed on a second pixel electrode, the firstlight converting unit including a first plurality of quantum dotparticles configured to convert light incident on the first lightconverting unit to the first color.

A plurality of light dispersion particles may be distributed throughoutthe light transmitter and the first light converting unit.

The display panel may further include a light source configured toradiate light towards the light transmitter and the first lightconverting unit.

The display panel may further include a second light converting unitdisposed on a third pixel electrode, the second light converting unitincluding a second plurality of quantum dot particles configured toconvert light incident on the second light converting unit to a secondcolor.

Each of the first plurality of quantum dot particles may have a diameterin a range of 2 nm to 3 nm, and each of the second plurality of quantumdot particles may have a diameter in a range of 5 nm to 6 nm.

The display panel may further include a light source configured toradiate blue light towards the light transmitter, the first lightconverting unit and the second light converting unit, the first colormay be green, and the second color may be red.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or other aspects will become apparent and more readilyappreciated from the following description of exemplary embodiments,taken in conjunction with the accompanying drawings in which:

FIG. 1 is a view illustrating a quantum dot converter and a lighttransmitter used in a display panel of a display assembly according toan exemplary embodiment;

FIG. 2 is a view illustrating the light transmitter in detail accordingto an exemplary embodiment;

FIG. 3 is a view illustrating an external light source according to anexemplary embodiment;

FIG. 4 is a graph illustrating a relationship between intensity andwavelength of light emitted from a light source according to anexemplary embodiment;

FIG. 5 is a side cross-sectional view illustrating a display panelaccording to an exemplary embodiment;

FIG. 6 is a view illustrating transmission of light based on anarrangement of liquid crystals in a liquid crystal layer according to anexemplary embodiment;

FIG. 7 is a view illustrating blocking of light based on an arrangementof liquid crystals in a liquid crystal layer according to an exemplaryembodiment;

FIG. 8 is a side view illustrating size relations between a firstelectrode and a light transmitter, a red light quantum dot unit, and agreen light quantum dot unit according to an exemplary embodiment;

FIG. 9 is a plan view illustrating size relations between the firstelectrode and the light transmitter, the red light quantum dot unit, andthe green light quantum dot unit according to an exemplary embodiment;

FIG. 10 is a side view illustrating of size relations between a firstelectrode with a light transmitter, a red light quantum dot unit, and agreen light quantum dot unit according to an exemplary embodiment;

FIG. 11 is a plan view illustrating size relations between the firstelectrode and the light transmitter, the red light quantum dot unit, andthe green light quantum dot unit according to an exemplary embodiment;

FIG. 12A is a view illustrating a color gamut for describing a colorreproducing ratio by a display panel according to an exemplaryembodiment;

FIG. 12B is an enlarged view illustrating an area of a blue family inthe color gamut of FIG. 12A;

FIG. 12C is a table illustrating an example of locations of red, green,and blue colors in the color gamut of FIG. 12A;

FIG. 13A is a view illustrating a color gamut for describing a colorreproduction ratio of a display panel using a light converting unit or alight converter included in a light source according to an exemplaryembodiment;

FIG. 13B is an enlarged view illustrating an area of a blue family inthe color gamut of FIG. 13A;

FIG. 14 is a table illustrating an example of locations of red, green,and blue colors in the color gamut of FIG. 13A;

FIGS. 15 to 18 illustrated structures in which a red light quantum dotunit, a green light quantum dot unit, and a light transmitter aredisposed according to various exemplary embodiments;

FIG. 19 is a side cross-sectional view illustrating another exemplaryembodiment of a display panel;

FIG. 20 is a perspective view illustrating an exterior of an exemplaryembodiment of a display apparatus;

FIG. 21 is a structural view illustrating an exemplary embodiment of adisplay apparatus;

FIG. 22 is an exploded perspective view illustrating a first exemplaryembodiment of a display apparatus;

FIG. 23 is a side cross-sectional view illustrating the first exemplaryembodiment of the display apparatus;

FIG. 24 is a view illustrating a blue light emitting diode illuminationlamp as an exemplary embodiment of a light source of the displayapparatus;

FIG. 25 is a side cross-sectional view illustrating a display panel of afirst exemplary embodiment of the display apparatus;

FIG. 26 is an exploded perspective view illustrating a second exemplaryembodiment of a display apparatus;

FIG. 27 is a side cross-sectional view illustrating the second exemplaryembodiment of the display apparatus;

FIG. 28 is an exploded perspective view illustrating a third exemplaryembodiment of the display apparatus; and

FIG. 29 is a side cross-sectional view illustrating the third exemplaryembodiment of the display apparatus.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. Accordingly, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be suggested to those of ordinary skill inthe art. The progression of processing operations described isexemplary, and the sequence of and/or operations is not limited to thatset forth herein and, unless noted otherwise, may be changed as is knownin the art. In addition, descriptions of well-known functions andconstructions may be omitted for increased clarity and conciseness.

Exemplary embodiments will now be described more fully with reference tothe accompanying drawings. The exemplary embodiments may, however, beembodied in many different forms and should not be construed as beinglimited to the exemplary embodiments set forth herein. These exemplaryembodiments are provided so that this disclosure will be thorough andcomplete and will fully convey the exemplary embodiments to those ofordinary skill in the art.

It will be understood that, although the terms first, second, etc., maybe used herein to describe various elements, these elements should notbe limited by these terms. These terms are only used to distinguish oneelement from another. As used herein, the term “and/or,” includes anyand all combinations of one or more of the associated listed items.Expressions such as “at least one of,” when preceding a list ofelements, modify the entire list of elements and do not modify theindividual elements of the list.

It will be understood that when an element is referred to as being“connected,” or “coupled,” to another element, it can be directlyconnected or coupled to the other element or intervening elements may bepresent. In contrast, when an element is referred to as being “directlyconnected,” or “directly coupled,” to another element, there are nointervening elements present.

The terminology used herein is for the purpose of describing particularexemplary embodiments only and is not intended to be limiting. As usedherein, the singular forms “a,” “an,” and “the,” are intended to includethe plural forms as well, unless the context clearly indicatesotherwise.

Reference will now be made in detail to exemplary embodiments, aspectsof which are illustrated in the accompanying drawings, wherein likereference numerals refer to like elements throughout.

FIG. 1 is a view illustrating an operating principle of a quantum dotconverter and a light transmitter used in a display panel of a displayassembly, and FIG. 2 is a view illustrating the light transmitter indetail.

Referring to FIGS. 1 and 2, a display assembly 1 may include a lightsource 2, a quantum dot converter 3, and a light transmitter 6. Lightemitted from the light source 2 is incident on the quantum dot converter3 and the light transmitter 6.

The light source 2 may emit light L, which may be incident on thequantum dot converter 3 or the light transmitter 6. In the exemplaryembodiment, the light source 2 may emit blue-based light. In this case,the blue-based light may be partially biased to a green color. The lightsource 2 will be described below.

The quantum dot converter 3 may change a color of the light L emittedfrom the light source 2 and incident on one side of the quantum dotconverter 3, and emit light RL and GL of different colors from anopposite side of the quantum dot converter. For example, the quantum dotconverter 3 may convert blue light BL emitted from the light source 2into red light RL or green light GL, and then emit the converted lightto the outside. In particular, the quantum dot converter 3 may changethe wavelength of the incident light, and emit light having a differentcolor from that of the incident light (wavelength shift).

The quantum dot converter 3 may change a color of the light L emittedfrom the light source 2 using quantum dots (QD).

Quantum dots may refer to semiconductor crystals formed by aggregatinghundreds to thousands of atoms. A quantum dot may be in a range ofseveral nanometers to tens of nanometers. Because of the small size, thequantum dot may take advantage of a quantum confinement effect. In thequantum confinement effect, when the particles are very small, electronsin a particle form a discrete energy state by an outer surface of theparticle, and as the size of a space in the particle is small, an energystate of the electron is relatively increased and a bandgap is widened.Thus, the quantum dots, according to the above quantum confinementeffect, may be used to generate light having various wavelengths whenlight such as ultraviolet light, visible light, and/or the like isincident thereon. In this case, the quantum dot disperses and emits theincident light.

A length of a wavelength of light generated from quantum dots may dependon a size of a particle. In particular, when light has a wavelengthhaving a greater energy than bandgap energy is incident onto the quantumdot, the quantum dot absorbs energy of the light and is excited, emitslight having a predetermined wavelength, and thus, becomes a groundstate. In this case, when the size of the quantum dot is small, lighthaving a relatively short wavelength such as blue-based light orgreen-based light may be generated, and when the size of the quantum dotis large, light having a relatively long wavelength such as red-basedlight may be generated. Thus, light of various colors may be realizedbased on sizes of the quantum dots.

Hereinafter, a quantum dot particle capable of emitting green lightbased on incident light is referred to as a green quantum dot particle,and a quantum dot particle capable of emitting red light based onincident light is referred to as a red quantum dot particle. The greenquantum dot particle may have a width in a range of 2 nm to 3 nm, andthe red quantum dot particle may have a width in a range of 5 nm to 6nm.

The quantum dot converter 3 may include a plurality of quantum dots, andthe plurality of quantum dots may emit light of various colors based onsizes thereof. Thus, the quantum dot converter 3 may convert incidentlight using the quantum dots, and emit light of different colors.

The quantum dot converter 3 may include one surface 3 i (hereinafter,referred to as a first incident surface) on which the light, such asblue light BL radiated from the light source, is incident and the othersurface 3 t (hereinafter, referred to as a first emitting surface) fromwhich the light RL and GL having the converted colors are emitted. Thefirst incident surface 3 i is disposed to face the light source 2, andthe first emitting surface 3 t is disposed to face a direction oppositethe light source 2.

The first emitting surface 3 t may be designed to have a greater areathan a second emitting surface 6 t through which light is emitted fromthe light transmitter 6. Thus, when an amount of light emitting per unitarea is the same, the first emitting surface 3 t emits more light thanthe second emitting surface 6 t of the light transmitter 6. When thefirst emitting surface 3 t is provided to have a greater area than thesecond emitting surface 6 t, the first incident surface 3 i may also beprovided to have a greater area than the second incident surface 6 i.

The first incident surface 3 i of the quantum dot converter 3 mayinclude a third incident surface 4 i and a fourth incident surface 5 ionto which light radiated from the light source 2, for example,blue-based lights are respectively incident, and the first emittingsurface 3 t may include a third emitting surface 4 t from whichred-based light is emitted, and a fourth emitting surface 5 t from whichgreen-based light is emitted.

In some exemplary embodiments, a filtering part 16 e (shown in FIG. 19)may be further installed on the first emitting surface 3 t. Thefiltering part 16 e will be described below.

The quantum dot converter 3 may include at least one red light quantumdot unit 4 and at least one green light quantum dot unit 5.

The red light quantum dot unit 4 emits red-based light RL based on aquantum isolation effect. The red light quantum dot unit 4 is formed toinclude a plurality of red quantum dot particles, and a size of the redquantum dot particle in the red light quantum dot unit 4 is relativelygreater than a size of the green quantum dot particle in the green lightquantum dot unit 5.

The green light quantum dot unit 5 emits green-based light GL having awavelength greater than the incident blue-based light BL. The greenlight quantum dot unit 5 is formed to include a plurality of greenquantum dot particles, and a size of the green quantum dot particle isrelatively smaller than a size of the red quantum dot particle in thered light quantum dot unit 4.

The red light quantum dot unit 4 and the green light quantum dot unit 5may have a thin plate shape having a predetermined thickness, and may bedisposed on a substrate or the like. In this case, the red light quantumdot unit 4 may include the third incident surface 4 i onto which lightradiated from the light source 2, for example, the blue light BL isincident and the third emitting surface 4 t from which the converted redlight RL is emitted. Similarly, the green light quantum dot unit 5 mayinclude the fourth incident surface 5 i onto which light radiated fromthe light source 2 is incident and the fourth emitting surface 5 t fromwhich the green light GL is emitted.

In an exemplary embodiment, an area of the third emitting surface 4 tmay be equal to or greater than that of the second emitting surface 6 tthrough which light is emitted from the light transmitter 6. In the sameway, an area of the third incident surface 4 i may be equal to orgreater than that of the second incident surface 6 i on which the lightBL is incident on the light transmitter 6. In an exemplary embodiment,an area of the fourth emitting surface 5 t may be equal to or greaterthan that of the second emitting surface 6 t through which the light isemitted from the light transmitter 6, and an area of the fourth incidentsurface 5 i may be equal to or greater than that of the second incidentsurface 6 i. Also, both areas of the third emitting surface 4 t and thefourth emitting surface 5 t may be greater than the area of the secondemitting surface 6 t.

When the area of the third incident surface 4 i and the area of thefourth incident surface 5 i are greater than the area of the secondincident surface 6 i, more light BL may be incident onto the thirdincident surface 4 i and the fourth incident surface 5 i than onto thesecond incident surface 6 i. Also, when the area of the third emittingsurface 4 t and the area of the fourth emitting surface 5 t are greaterthan that of the second emitting surface 6 t, more light (RL and GL) maybe emitted from the third emitting surface 4 t and the fourth emittingsurface 5 t than from the second emitting surface 6 t. Thus, when thearea of the third incident surface 4 i and the area of the fourthincident surface 5 i are greater than that of the second incidentsurface 6 i, or the area of the third emitting surface 4 t and the areaof the fourth emitting surface 5 t are greater than that of the secondemitting surface 6 t, an amount of the light RL and GL incident onto oremitted from the red light quantum dot unit 4 or the green light quantumdot unit 5 is greater than an amount of the light TL emitted from thelight transmitter 6. Therefore, a ratio of the emitted red-based lightRL, the green-based light GL, and the blue-based light TL may be equalto or similar to each other.

The red light quantum dot unit 4 and the green light quantum dot unit 5may be disposed adjacent to each other, and in this case, side surfacesof the red light quantum dot unit 4 and the green light quantum dot unit5 may contact each other. Alternatively, the red light quantum dot unit4 and the green light quantum dot unit 5 may be spaced apart from eachother by a predetermined distance. When the side surfaces of the redlight quantum dot unit 4 and the green light quantum dot unit 5 arespaced apart from each other, a predetermined material may be insertedbetween the red light quantum dot unit 4 and the green light quantum dotunit 5, thereby preventing an interference therebetween.

Because the quantum dots cause the light to be dispersed, the red lightquantum dot unit 4 and the green light quantum dot unit 5 disperse andemit the red light RL and the green GL in various directions.

In an exemplary embodiment, a filtering part 16 e (shown in FIG. 19)configured to filter a part of the emitted light may be further providedon the third emitting surface 4 t and the fourth emitting surface 5 t ofthe red light quantum dot unit 4 and the green light quantum dot unit 5.

In an exemplary embodiment, the filtering part 16 e may filter theblue-based light. Colors of the blue-based light incident onto the redlight quantum dot unit 4 and the green light quantum dot unit 5 aregenerally changed by the quantum dots. However, a part of the blue-basedlight may be emitted from the red light quantum dot unit 4 and the greenlight quantum dot unit 5 without contacting the quantum dots. Thus, thefiltering part 16 e may be used to filter the blue-based light emittedfrom the red light quantum dot unit 4 and the green light quantum dotunit 5. When the filtering part 16 e filters the blue-based light, thefiltering part 16 e may include a blue light cut-off filter (BCF).

The light transmitter 6 emits light radiated from the light source 2 ina direction opposite an incident direction. In this case, in the lighttransmitter 6, as illustrated in FIG. 2, a part of the incident light Lis directly transmitted (BLA1), another other parts are dispersed andtransmitted (BL1 to BL3), or converted into light GL1 to GL3 ofdifferent colors and then emitted. When the light incident from thelight source 2 is the blue-based light BL, the light transmitter 6 mayemit blue light BLA1 and BL1 to BL3 having the same color as theincident light together with light having a different color such asgreen-based light GL1 to GL3.

The light transmitter 6 may be a thin plate having a thickness similarto the red light quantum dot unit 4 and the green light quantum dot unit5. Light radiated from the light source is incident onto one surface (6i, hereinafter, referred to as a second incident surface) of the lighttransmitter 6, and light is emitted from the other surface 6 t(hereinafter, referred to as a second emitting surface) of the lighttransmitter 6.

As illustrated in FIG. 2, the light transmitter 6 may include a mainbody 8, at least one dispersion particle 7 a dispersed in the main body8, and at least one light converting unit 7 b dispersed in the main body8 and converting the light BL of a predetermined color into light of adifferent color.

The main body 8 may be provided with a light transmitting materialcapable of transmitting all or a part of incident light. Here, the lighttransmitting material may include a material having a transparency equalto or more than a predetermined level such as a resin including anatural resin, a synthetic resin, and/or the like, or glass and/or thelike. The synthetic resin may include an epoxy resin, a urethane resin,polymethyl methacrylate (PMMA), and/or the like, and the glass mayinclude silicate glass, borate glass, phosphate glass, and/or the like.Additionally, various materials capable of transmitting various types oflight may be used as the light transmitting material according to one ormore exemplary embodiments.

Light of a predetermined color such as the blue-based light BL may beincident onto the main body 8 through the incident surface 6 i, andthen, emitted to the outside through the second emitting surface 6 t.

A part of the light BL incident onto the main body 8 (BLA) may encounterneither the dispersion particle 7 a nor the light converting unit 7 bwhile passing through the main body 8, and be emitted without a changeof direction or color through the second emitting surface 6 t (BLA1).Also, other parts of the light BL incident onto the main body 8 (BLB andBLC) may be dispersed or color-changed by any one of the dispersionparticle 7 a and the light converting unit 7 b, and then emitted (BL1 toBL3 and GL1 to GL3).

The dispersion particles 7 a may be disposed in the main body 8 in arandom or predetermined pattern, and disperse incident light in apredetermined range. For example, the dispersion particle 7 a maydisperse the incident blue-based light BLB. A part BLA of the incidentblue-based light BL contacts the dispersion particle 7 a and isdispersed and emitted. Thus, a part BLB of the light BL incident ontothe light transmitter 6 is dispersed in a predetermined range, andpasses through the light transmitter 6 (BL1 to BL3).

In an exemplary embodiment, the dispersion particle 7 a may include atleast one of zinc oxide (Zn_(x)O_(x)), titanium oxide (Ti_(x)O_(x)), andsilicon oxide (Si_(x)O_(x)), and particles of various types capable ofdispersing incident light may also be adopted as the above dispersionparticle 7 a.

Because a part BLB of the incident light BL due to the dispersionparticle 7 a is dispersed and emitted (BL1 to BL3), the light passedthrough the light transmitter 6 may be dispersed and emitted in a rangeequal to or similar to that of the light RL and GL emitted from the redlight quantum dot unit 4 and the green light quantum dot unit 5.

When the blue-based light BL passes through the light transmitter 6,because the incident blue light BL is diffused and emitted more than ina case in which the dispersion particle 7 a does not exist, the bluelight BL may be emitted in a forward direction d1 as well as an obliquedirection d2. The range in which the blue-based light BLB is dispersedmay be different based on types of the dispersion particle 7 a, and/orthe like. Thus, because the blue-based light BLB is dispersed by thedispersion particle 7 a, a disadvantageous color viewing angle which maybe caused by smaller dispersion of the blue-based light than light ofother colors may be solved.

The light converting units 7 b are disposed in the main body 8 in arandom or predetermined pattern, and change the color of the incidentlight, which can then be emitted. For example, when the incident lightis the blue-based light BL, the blue-based light BL may be convertedinto the green-based light GL or the red-based light RL and emitted.

The light converting unit 7 b, for example, may include a green lightconverting unit which converts the blue-based light BLC into thegreen-based light GL.

In an exemplary embodiment, the green light converting unit may includeat least one of a green quantum dot particle and a green fluorescentparticle. In other words, in the main body 8, only green quantum dotparticles may be disposed, or only green fluorescent particles may bedisposed, or both the green quantum dot particles and the greenfluorescent particles may be disposed. When the green quantum dotparticles and the green fluorescent particles are both disposed in themain body 8, both may be included in the same ratio, or in a differentratio.

The green quantum dot particle may be a semiconductor crystal having theabove described size of 2 nm to 3 nm.

Because the green fluorescent particle changes a wavelength of incidentlight, light of a predetermined color may be converted into green-basedlight. For example, the green fluorescent particle may convert theblue-based light BLC into the green-based light GL1 to GL3.

The green fluorescent particle may disperse and emit the incident lightBLC. In this case, after the incident blue-based light BLC is convertedinto the green-based light GL1 to GL3, the green-based light GL1 to GL3may be emitted in a forward direction d3 as well as an oblique directiond4.

The green fluorescent particle may be a particle having a width ofseveral nanometers to tens of nanometers, and may include variousinorganic fluorescent materials (for example, ZnS(Ag), and/or the like)realized using zinc sulfide, cadmium sulfide, and/or the like.Additionally, for example, means of various types capable of emittingthe green-based light by changing the wavelength of the blue-based lightmay be used as a green fluorescent particle.

In an exemplary embodiment, the green fluorescent particle may include agreen fluorescent material having a maximum width of 540 nm or less.

Thus, when the green light converting unit is provided in the main body8 of the light transmitter 6 onto which the blue-based light BL isincident, a wavelength of a part of blue-based light passed through thelight transmitter 6 is changed, and becomes the green-based light GL1 toGL3. Thus, in the light transmitter 6, because an emitted light is amixture of the blue-based light BLA1 and the green-based light GL1 toGL3 which are passed through the main body 8, the emitted blue-basedlight TL has an added green color compared with a case in which thegreen light converting unit does not exist. Thus, when the incidentblue-based light BL is more turbid than a primary blue, the primarycolor may be emitted from the light transmitter 6.

The dispersion particles 7 a and the light converting units 7 b may bedistributed in the main body 8 in nearly the same ratio, or distributedin a different ratio. In other words, the dispersion particles 7 a andthe light converting units 7 b may be included in the main body 8 innearly the same ratio, or the dispersion particles 7 a may be includedin a greater amount than the light converting units 7 b, or in contrast,the light converting units 7 b may be included in a greater amount thanthe dispersion particles 7 a.

When the dispersion particles 7 a and the light converting units 7 b aremanufactured by curing the main body 8, such as an epoxy resin and/orthe like, in a liquid state, the dispersion particles 7 a and the lightconverting units 7 b may be injected into the main body 8 anddistributed in the main body 8, and the dispersion particles 7 a and thelight converting units 7 b may be injected into the main body 8 beforecuring the main body 8 or during a process of curing the main body 8.

A small amount of the dispersion particles 7 a and light convertingunits 7 b may be included in the main body 8, but the amount of thedispersion particles 7 a and the light converting units 7 b included inthe main body 8 may be changed according to one or more exemplaryembodiments. For example, when increased dispersion of the incidentlight BL is desired, additional dispersion particles 7 a may be injectedinto the main body 8. Also, when the blue-based light BL is incident,and more green-based light is desired to be emitted, more lightconverting units 7 b may be injected into the main body 8.

The dispersion particles 7 a and the light converting units 7 b may beomitted according to exemplary embodiments. In particular, when a lightconverter 2 d is provided in the light source 2, the light convertingunits 7 b may be omitted.

The quantum dot converter 3 and the light transmitter 6, moreparticularly, the red light quantum dot unit 4, the green light quantumdot unit 5, and the light transmitter 6 may be disposed on the sameplane in the display panel, and may be formed in one thin plate shape.The light transmitter 6, the red light quantum dot unit 4, the greenlight quantum dot unit 5, and the light transmitter 6 may be installedon a predetermined substrate to provide stability. The substrate may beformed of a transparent material, and thus, may transmit the lightemitted from the red light quantum dot unit 4, the green light quantumdot unit 5, and the light transmitter 6. For example, the substrate maybe formed of a transparent material such as poly methyl methacrylateresin.

The light source 2 generates light, and radiates the light onto thequantum dot converter 3 and the light transmitter 6. The light source 2may generate light having intensity and luminance corresponding toelectric power applied from the outside, and radiate the light onto thequantum dot converter 3 and the light transmitter 6. By requirements,the light generated from the light source 2 may be reflected from anadditional reflective plate, an aperture, and/or the like, and may beradiated in a direction toward the quantum dot converter 3 and the lighttransmitter 6.

FIG. 3 is a view illustrating an example of an external light source,and FIG. 4 is a graph illustrating a relationship between intensity andwavelength of light emitted from a light source. In FIG. 4, a y-axisrepresents the intensity of the light, and an x-axis represents thewavelength of the light.

The light source 2 may generate light of a predetermined color, and maygenerate blue-based light BL in an exemplary embodiment. The blue-basedlight BL represents light having a wavelength relatively shorter thanred-based light or green-based light, 400 nm to 500 nm. The blue-basedlight BL incident onto the quantum dot converter 3 is converted into thered-based light RL or the green-based light GL, and is emitted to theoutside. The blue light BL incident onto the light transmitter 6 may betransmitted through the light transmitter, dispersed in the lighttransmitter 6, or converted into the green-based light, and then,emitted.

The display assembly 1 may include only one light source 2 or aplurality of light sources 2. When the display assembly 1 includes theplurality of light sources 2, the light sources 2 may be provided ineach of the red light quantum dot unit 4 and the green light quantum dotunit 5 of the quantum dot converter 3, and the light transmitter 6. Inthis case, the number of light sources 2 corresponds to the number ofthe red light quantum dot units 4, the number of green light quantum dotunits 5, and the number of light transmitters 6.

The light source 2 may be realized using a light bulb, a halogen lamp, afluorescent lamp, a sodium lamp, a mercury lamp, a fluorescent mercurylamp, a xenon lamp, an arc illumination lamp, a neon tube lamp, anelectroluminescent (EL) lamp, a light emitting diode (LED) lamp, a coldcathode fluorescent lamp (CCFL), an external electrode fluorescent lamp(EEFL), and/or the like. Additionally, various illumination devicesconfigured to generate light of a predetermined color, such as a bluecolor, may be used as the light source 2.

Referring to FIG. 3, the light source 2 may include a housing 2 a, aninner space 2 b, a light emitter 2 c, a light converter 2 d, and a lightemitter 2 e.

The housing 2 a is provided to form an exterior of the light source 2,has the inner space 2 b therein, and includes the light emitter 2 c inthe inner space 2 b. For example, the housing 2 a includes an outer wallframe and a bottom frame which form the inner space 2 b, and the lightemitter 2 c may be formed on one surface of the bottom frame toward theinner space 2 b. Various cables or circuits configured to supplyelectric power to the light emitter 2 c may be provided on one surfaceor an opposite surface in a direction toward the inner space 2 b of thelower frame. The housing 2 a blocks leakage of incident light toward theoutside, and the light emitted from the light emitter 2 c or the lightconverted by the light converter 2 d is emitted only in a predetermineddirection.

The inner space 2 b is formed by the housing 2 a and the light emitter 2e, and air, particles, and/or the like related to generation of thelight or conversion of the light are located therein. At least one lightconverter 2 d is disposed in the inner space 2 b.

The light emitter 2 c may generate and emit light BLD of a predeterminedcolor based on the electric power supplied from the external powersource 9. The light emitter 2 c may be realized using an LED. The LED,for example, may include a blue LED, and in this case, the light emitter2 c may emit the blue-based light BLD.

The light converter 2 d changes color of a part of the light BLD emittedfrom the light emitter 2 e and emits green-based light GL0

In an exemplary embodiment, when the blue-based light BLD is emittedfrom the light emitter 2 c, the light converter 2 d may convert theblue-based light BLD into green-based light and emit the converted lightthrough light emitter 2 e. In other words, the light converter 2 d maychange a wavelength of the light BLD emitted from the light emitter 2 c,and for example, the wavelength of the emitted light BLD may be changedto be increased.

In this case, the light converter 2 d may include a green lightconverting unit configured to convert the blue-based light BLD into thegreen-based light GL0.

Here, the green light converting unit may include at least one of agreen quantum dot particle and a green fluorescent particle. The greenquantum dot particle, as described above, refers to a semiconductorcrystal having a size of 2 nm to 3 nm, and the green fluorescentparticle changes a wavelength of the incident light to convert the lightof a predetermined color into the green-based light. In an exemplaryembodiment, the green fluorescent particle may include a greenfluorescent material having a maximum width of 540 nm or less. The greenquantum dot particle or the green fluorescent particle may have adroplet shape.

When the blue-based light BLD is emitted from the light emitter 2 c, apart of the blue-based light BLD may be converted into the green-basedlight GL0 by the light converter 2 d and emitted to the outside, or maybe emitted to the outside without a change of the color (BLE). Thus, thelight emitter 2 e may emit the blue-based light BLE and the green-basedlight GL0, and the emitted blue-based light BLE and the emittedgreen-based light GL0 are mixed.

Thus, as illustrated in FIG. 4, the light L emitted from the lightsource 2, according to the graph, may include a first area Z1 displayedby the light BLE which is emitted by the light emitter 2 c of the bluelight emitting diode and whose wavelength is not changed and a secondarea Z2 displayed by the green-based light GL0 which has been convertedby the light converter 2 d. In this case, an intensity of light in thesecond area Z2 may be changed based on a distribution amount of thelight converters 2 d. In particular, when the light converters 2 d areprovided in the inner space 2 b at a larger amount, the intensity of thelight in the second area Z2 is greatly increased, and is more protrudedin the second area Z2 in the graph. In contrast, when the lightconverters 2 d are provided in the inner space 2 b at a smaller amount,the intensity of the light in the second area Z2 is more decreased, andhas a flatter shape in the second area Z2 in the graph. Thus, the colorof the emitted light L may be controlled by changing the amount of thelight converters 2 d. Meanwhile, as illustrated in FIG. 4, the light Lemitted from the light source 2 may have a greater intensity in theblue-based light than the green-based light.

Thus, because the light source 2 may emit the light L closer to thegreen color than the blue-based light emitted from a blue light emittingdiode, although more turbid blue light is emitted from the blue lightemitting diode, originally desired blue-based light or light similar toa blue color may be emitted.

When the blue-based light L mixed with the green-based light is emittedfrom the light source 2, the light converting unit 7 b in the lighttransmitter 6 such as the green quantum dot particle or the greenfluorescent particle may be omitted. In other words, because the lightsource 2 emits the blue-based light mixed with the green-based light,the light incident onto the light transmitter 6 may be the blue-basedlight mixed with the green-based light, and thus, the blue-based lightTL added with a green color may be emitted without a change of the colorof the incident light L. Also, in some exemplary embodiments, althoughthe blue-based light L mixed with the green-based light is emitted fromthe light source 2, the light converting unit 7 b may be provided in thelight transmitter 6. In this case, the light converting unit 7 b in thelight transmitter 6 mixes more amount of green-based light with theblue-based light L in which the incident green-based light is mixed, andemits the mixed light (TL). Thus, although the blue-based light BLD andBLE emitted from the blue light emitting diode which is the lightemitter 2 c is more turbid than a primary blue color, the blue-basedlight TL closer to the primary color in the light transmitter 6 may beemitted by the light converter 2 d in the light source 2 and the lightconverting unit 7 b in the light transmitter 6.

In some exemplary embodiments, the light converter 2 d may be omitted.For example, when the light converting unit 7 b is provided in the lighttransmitter 6, the light source 2 may not include the light converter 2d.

The light emitter 2 e may be installed in the housing 2 a, and may forman inner space 2 b with the housing 2 a. The light emitter 2 e, forexample, may be installed on an outer wall of the housing 2 a, etc. Thelight emitter 2 e may emit light emitted from the light emitter 2 c andthe light converted by the light converter 2 d in a predetermineddirection. The light emitter 2 e may be formed of a transparent materialthrough which light is transmitted. Here, the transparent material, forexample, may be realized using glass or a synthetic resin an acrylicresin. Also, the light emitter 2 e may be realized using varioustransparent materials.

In FIG. 3, the exemplary embodiment including the light emitter 2 ehaving a planar shape is described, but the shape of the light emitter 2e is not limited thereto, and may have various shapes such as asemicircle, a cylinder, a triangular pyramid, a cylinder having asemispherical shaped head, and/or the like.

Hereinafter, a display panel including the above quantum dot converterand the light transmitter will be described.

FIG. 5 is a side cross-sectional view illustrating an exemplaryembodiment of a display panel. FIG. 6 is a view illustrating blocking oflight based on an arrangement of liquid crystals in a liquid crystallayer, and FIG. 7 is a view illustrating transmission of light based onan arrangement of liquid crystals in a liquid crystal layer.Hereinafter, for convenience of descriptions, in FIGS. 5 to 7, upwarddirections of the drawings will be referred to as forward directions,and downward directions of the drawings will be referred to as rearwarddirections.

As illustrated in FIGS. 5 to 7, a display panel 10 may include a firstpolarizing filter 11, a first substrate 12, a first electrode 13, asecond electrode 14, a liquid crystal layer 15, a quantum dot sheet 16,a second substrate 17, and a second polarizing filter 18.

The first polarizing filter 11 may polarize light L incident from anexternal light source, and transmit light only vibrating in a directionthe same as a polarizing axis to the first substrate 12. The firstpolarizing filter 11, as illustrated in FIGS. 5 to 7, may be provided tohave a rear surface facing a light source and a front surface in contactwith the rear surface of the first substrate 12 or adjacent thereto. Thefirst polarizing filter 11 may be formed in a film shape. In anexemplary embodiment, the first polarizing filter 11 may be a verticalpolarizing filter or a horizontal polarizing filter.

The first electrode 13 may be installed on a front surface of the firstsubstrate 12, and the first polarizing filter 11 may be installed on arear surface of the first substrate 12. The first substrate 12 may beformed of a transparent material to transmit the light incident in therearward direction, and for example, may be realized in a syntheticresin such as an acrylic, glass, and/or the like. In an exemplaryembodiment, the first substrate 12 may include a flexible printedcircuit board (FPCB).

The first electrode 13 installed on the first substrate 12 applies acurrent to the liquid crystal layer 15 based on an applied electricpower along with the second electrode 14, and thus as illustrated inFIGS. 6 and 7, may adjust arrangement of liquid crystal molecules 15 aand 15 b in the liquid crystal layer 15. Therefore, based on thearrangement of the liquid crystal molecules 15 a and 15 b, a vibrationdirection of the light PL polarized by the first polarizing filter 11may be changed or not changed.

In an exemplary embodiment, the first electrode 13 may be realized usinga thin film transistor (TFT). The first electrode 13 may be connected tothe external power source to receive electric power. The firstelectrodes 13 may be installed in plural number on the first substrate12, and the first electrode 13 may be installed on the first substrate12 in a predetermined pattern. Each of the first electrodes 13 may beinstalled on the first substrate 12 corresponding to each of liquidcrystal molecules 15 a and 15 b in the liquid crystal layer 15.

The second electrode 14 is provided to correspond the first electrode 13with respect to the liquid crystal layer 15, and applies a current to aliquid crystal layer 15 along with the first electrode 13. One surfaceof the second electrode 14 is provided to contact the quantum dot sheet16, and the other surface of the second electrode 14 is provided tocontact the liquid crystal layer 15. The second electrode 14 may berealized as a common electrode.

The liquid crystal layer 15 is provided between the second electrode 14and the first electrode 13, and a plurality of liquid crystal moleculesare disposed in the liquid crystal layer 15.

A liquid crystal is a material in a middle state between a liquid stateand a crystal state, and may include a plurality of liquid crystalmolecules 15 a and 15 b. The liquid crystal molecules 15 a and 15 b maybe arranged in a plurality of rows in the liquid crystal layer 15. Theliquid crystal layer 15 may directly transmit, or change a vibrationdirection and then transmit, light polarized by the first polarizingfilter 11 based on alignment of the liquid crystal molecules 15 a and 15b.

In particular, the liquid crystal molecules in the liquid crystal layer15 may be arranged in different shapes based on electric power appliedbetween the second electrode 14 and the first electrode 13.

When an electrical field is not applied, the liquid crystal molecule 15a may be twisted and arranged in a spiral shape as shown in FIG. 6. Inthis case, the liquid crystal molecule 15 a may be aligned in the spiralshape in a direction perpendicular to a line segment connected with thefirst electrode 13 or the second electrode 14. When the liquid crystalmolecule 15 a is twisted and aligned in the above shape, a vibrationdirection of the polarized light PL incident onto the liquid crystallayer 15 is twisted by about 90 degrees (PL1). That is, the vibrationdirection of the polarized light is changed.

In contrast, when the electrical field is applied by the first electrode13 and the second electrode 14, the liquid crystal molecule 15 b may bealigned and arranged in a direction parallel with the line segmentconnecting the first electrode 13 with the second electrode 14 as shownin FIG. 7 based on the generated electrical field. In this case, thevibration direction of the polarized light PL is not changed, and thelight directly passes through the liquid crystal layer 15 (PL2).

In other words, the liquid crystal layer 15 may change or not change thevibration direction of the polarized light based on the application ofthe electric power to the first electrode 13 and the second electrode14.

When the first polarizing filter 11 is a vertical polarizing filter, andthe second polarizing filter 18 is a horizontal polarizing filter, andwhen the liquid crystal molecule 15 a is twisted and aligned in thespiral shape as shown in FIG. 6, the liquid crystal molecule 15 apolarizes the light of the vertical direction passed through the firstpolarizing filter 11 in the horizontal direction. The light passedthrough the liquid crystal layer 15 and polarized in the verticaldirection may pass through the second polarizing filter 18, and thus,the light incident onto the liquid crystal layer 15 may be displayed bythe display panel 10.

When the first polarizing filter 11 is a vertical polarizing filter, andthe second polarizing filter 18 is a horizontal polarizing filter, andthe liquid crystal molecule 15 b is not twisted as shown in FIG. 7, theliquid crystal layer 15 directly transmits the light polarized by thefirst polarizing filter 11 in the vertical direction, and thus, thelight passed through the liquid crystal layer 15 is blocked by thesecond polarizing filter 18 which is a horizontal polarizing filter.Thus, the light passed through the liquid crystal layer 15 is notdisplayed by the display panel 10 to the outside.

The quantum dot sheet 16 may convert incident light having apredetermined color into light of a different color or output withoutconverting into the light of the different color. Thus, the quantum dotsheet 16 may function to display various colors on the display panel 10.

The quantum dot sheet 16 may be interposed between the second electrode14 and the second substrate 17.

Blue-based light, for example, may be incident onto the quantum dotsheet 16, and the quantum dot sheet 16 may include a light transmitter16 a configured to transmit the incident blue-based light, at least onered light quantum dot unit 16 b configured to convert the incidentblue-based light and emit red-based light, and at least one green lightquantum dot unit 16 c configured to convert the incident blue-basedlight and emit green-based light.

The light transmitter 16 a may directly transmit a part of the incidentlight for emission to the outside, or convert a color of a part of theincident light or disperse a part of the incident light for emission tothe outside. In particular, the light transmitter 16 a, as illustratedin FIGS. 1 and 2, may disperse all or a part of the blue-based light andemit the dispersed light in a forward direction. Also, the lighttransmitter 16 a may convert a part of the incident blue-based lightinto the green-based light and emit the converted in the forwarddirection. Thus, the light transmitter 16 a may emit a mixed lightincluding the blue-based light and the green-based light in a directiontoward the second substrate 17. In this case, green-based light may bealso dispersed and emitted in the direction toward the second substrate17.

In particular, the light transmitter 16 a, as illustrated in FIGS. 1 and2, may include a main body, and dispersion particles and convertingunits distributed in the main body.

The main body may be formed of a light transmitting material, and thelight transmission material may include a material having a transparencyof a predetermined level or greater, which may include a resin such as anatural resin or a synthetic resin, glass, and/or the like.

The dispersion particles disperse the incident blue light, and the bluelight is emitted in a direction toward the second substrate 17. Thus,the blue light passed through the second polarizing filter 18 and thesecond substrate 17 and emitted may be viewed in a viewing angle equalto the above described red light and green light or similar thereto. Thedispersion particle may include zinc oxide, titanium oxide, siliconoxide, and/or the like.

The light converting unit may convert a color of the light incident ontothe main body and emit. For example, when the incident light isblue-based light, the blue-based light may be converted into green-basedlight or red-based light and emitted.

In an exemplary embodiment, the light converting unit may include agreen light converting unit configured to convert the blue-based lightinto the green-based light, and here, the green light converting unitmay include at least one of a green quantum dot particle and a greenfluorescent particle.

The red light quantum dot unit 16 b may change a wavelength of theincident blue-based light using quantum dots, and emit the red-basedlight having a longer wavelength. The red light quantum dot unit 16 bincludes a plurality of red quantum dot particles, and a size of the redquantum dot particle in the red light quantum dot unit 16 b is greaterthan that of the green quantum dot particle in the green light quantumdot unit 16 c.

The green light quantum dot unit 16 c may change a wavelength of theincident blue-based light using quantum dots, and emit the green-basedlight having a longer wavelength than the blue-based light. The greenlight quantum dot unit 16 c includes a plurality of green quantum dotparticles, and a size of the green quantum dot particle in the greenlight quantum dot unit 16 c is smaller than that of the red quantum dotparticle in the red light quantum dot unit 16 b.

The red light quantum dot unit 16 b and the green light quantum dot unit16 c may convert the blue-based light transmitted from the liquidcrystal layer 15 into red or green colored light using quantum dots, andemit in the direction toward the second substrate 17. In this case, thered light quantum dot unit 16 b and the green light quantum dot unit 16c may change, disperse and emit the incident light. Thus, the red-basedlight or the green-based light passed through the second substrate 17and the second polarizing filter 18 may be viewed in a relatively widerange.

The red light quantum dot unit 16 b or the green light quantum dot unit16 c may have a predetermined size, and for example, may have asufficient size to convert all amount of the blue-based light passedthrough the liquid crystal molecules of the liquid crystal layer 15 intothe red-based light or the green-based light.

The light transmitter 16 a may be relatively smaller than at least oneof the red light quantum dot unit 16 b and the green light quantum dotunit 16 c, and for example, the light transmitter 16 a may be providedto have a relatively smaller width WB than at least one of the red lightquantum dot unit 16 b and the green light quantum dot unit 16 c. Inother words, at least one of the red light quantum dot unit 16 b and thegreen light quantum dot unit 16 c may be provided so that at least oneof an incident surface onto which light is incident and an emittingsurface from which the light emits may be wider than at least one of theincident surface and the emitting surface of the light transmitter 16 a.For example, widths WR and WG of the red light quantum dot unit 16 b andthe green light quantum dot unit 16 c may be relatively greater than thewidth WB of the light transmitter 16 a. Thus, because the red lightquantum dot unit 16 b and the green light quantum dot unit 16 c arelarger than the light transmitter 16 a, the red light quantum dot unit16 b and the green light quantum dot unit 16 c may emit a greater amountof the red-based light and the green-based light than the lighttransmitter 16 a.

The light transmitter 16 a, the red light quantum dot unit 16 b, and thegreen light quantum dot unit 16 c, as illustrated in FIG. 5, may bedisposed on a position corresponding to one group of liquid crystalmolecules of the liquid crystal layer 15. In particular, liquid crystalmolecules of one group are provided to correspond to one of lighttransmitters 16 a, and liquid crystal molecules of another group areprovided to correspond to one of the red light quantum dot units 16 b,and liquid crystal molecules of still another group are provided tocorrespond to one of the green light quantum dot units 16 c.

Even when the light transmitter 16 a is relatively smaller than at leastone of the red light quantum dot unit 16 b and the green light quantumdot unit 16 c, the size of liquid crystal molecules of a correspondingrow may be equal to the size of liquid crystal molecules of a rowcorresponding to at least one of the red light quantum dot unit 16 b andthe green light quantum dot unit 16 c. Thus, a part of the incident bluelight may not be transmitted by the light transmitter 16 a, but may beblocked by a blocking wall, and/or the like and may not be emitted inthe forward direction. Thus, the amount of blue light passed through thelight transmitter 16 a may be relatively smaller than at least one ofthe amount of red light and the amount of green light emitted from thered light quantum dot unit 16 b and the green light quantum dot unit 16c. Thus, a ratio of the amount of the blue light to the red light or thegreen light may be controlled.

In an exemplary embodiment, the red light quantum dot unit 16 b and thegreen light quantum dot unit 16 c may be disposed more in the quantumdot sheet 16 than in the light transmitter 16 a.

The light transmitter 16 a, the red light quantum dot unit 16 b, and thegreen light quantum dot unit 16 c may be in contact with each other, ormay be spaced apart from each other by a predetermined distance. Whenthe light transmitter 16 a, the red light quantum dot unit 16 b, and thegreen light quantum dot unit 16 c are spaced apart from each other, ablocking wall including a metal, a synthetic resin, a synthetic rubber,and/or the like may be provided therebetween.

The quantum dot sheet 16 may be installed on one surface of the secondsubstrate 17 in the rearward direction, and the second polarizing filter18 may be installed on one surface of the second substrate 17 in theforward direction. In particular, the red light quantum dot unit, thegreen light quantum dot unit, and the light transmitter may berespectively installed on the second substrate 17 in a predeterminedpattern. In this case, the second substrate 17 may be divided into aplurality of unit areas, the red light quantum dot unit, the green lightquantum dot unit, and the light transmitter may be installed in eachunit area in the same pattern and each of the unit areas may operate asone pixel.

The second substrate 17 may be formed of a transparent material, andthus, the red light, the green light, and the blue light emitted fromthe quantum dot sheet 16 may pass therethrough. For example, the secondsubstrate 17 may be manufactured using a synthetic resin such as anacrylic resin, glass, and/or the like.

An exemplary embodiment of the light transmitter 16 a, the red lightquantum dot unit 16 b, and the green light quantum dot unit 16 cdisposed on the second substrate 17 will be described below.

The second polarizing filter 18 may be installed on one surface in theforward direction of the second substrate 17, and polarize the incidentlight. In an exemplary embodiment, the second polarizing filter 18 maybe a horizontal polarizing filter or a vertical polarizing filter.

The second polarizing filter 18 may be provided to have a polarizingaxis different from that of the first polarizing filter 11. Inparticular, the polarizing axis of the second polarizing filter 18 maybe provided to cross the polarizing axis of the first polarizing filter11 at a right angle. For example, when the first polarizing filter 11 isa vertical polarizing filter, the second polarizing filter 18 may be ahorizontal polarizing filter. Thus, when a vibrating direction of thelight passed through the first polarizing filter 11 is not changed, thelight may not pass through the second polarizing filter 18, and thus,the light is not emitted to the outside of the display panel. Incontrast, when the light passed through the first polarizing filter 11passes through the liquid crystal layer 15, and the vibrating directionof the light is changed to be the same as the polarizing axis of thesecond polarizing filter 18, the light may pass through the secondpolarizing filter 18. In this case, the light may be emitted to theoutside.

Thus, the second polarizing filter 18 may transmit or block the lightpassed through and emitted from the second substrate 17, depending on astate of the LC layer. Thus, at least one of the light mixture TL of theblue-based light and the green-based light emitted from the lighttransmitter 16 a, red-based light RL emitted from the red light quantumdot unit 16 b, and green-based light GL emitted from the green lightquantum dot unit 16 c may be emitted to the outside or blocked.

FIG. 8 is a side view illustrating one example of size relations betweena first electrode and a light transmitter, a red light quantum dot unit,and a green light quantum dot unit, and FIG. 9 is a plan viewillustrating the one example of the size relations between the firstelectrode and the light transmitter, the red light quantum dot unit, andthe green light quantum dot unit. In the drawings of FIGS. 8 and 9,other components are omitted to show the relations between the firstelectrode 13 and the light transmitter 16 a, the red light quantum dotunit 16 b, and the green light quantum dot unit 16 c.

As described above, the second electrode 14 may be formed as a commonelectrode, and the first electrode 13 may be formed as a pixel electrodeaccording to a predetermined pattern.

As will be described below, the light transmitter 16 a, the red lightquantum dot unit 16 b, and the green light quantum dot unit 16 c mayform one pixel, and a plurality of pixels may be two-dimensionallyarranged to form one image. For example, the first electrode 13 mayinclude a first pixel electrode, a second pixel electrode, and a thirdpixel electrode, the first pixel electrode may be a blue pixelelectrode, the second pixel electrode may be a green pixel electrode,and the third pixel electrode may be a red pixel electrode.

Referring to FIGS. 8 and 9, one pixel Px may include a blue pixelelectrode 13T corresponding to a blue color, a green pixel electrode 13Gcorresponding to a green color, and a red pixel electrode 13Rcorresponding to a red color.

The blue pixel electrode 13T may apply an electric field correspondingto a blue color to a gap between the blue pixel electrode 13T and thesecond electrode 14, the green pixel electrode 13G may apply an electricfield corresponding to a green color to a gap between the green pixelelectrode 13G and the second electrode 14, and the red pixel electrode13R may apply an electric field corresponding to a red color to a gapbetween the red pixel electrode 13R and the second electrode 14.

Because the pixel electrodes 13T, 13G, and 13R apply the electric fieldsneeded to realize colors thereof as described above, a size of the lighttransmitter 16 a may correspond to the blue pixel electrode 13T, a sizeof the green light quantum dot unit 16 c may correspond to the greenpixel electrode 13G, and a size of the red light quantum dot unit 16 bmay correspond to the red pixel electrode 13R, as illustrated in FIGS. 8and 9.

Specifically, a width WB (see FIG. 19) of the light transmitter 16 a maynot exceed a width of WB′ of the blue pixel electrode 13T, a width WG(see FIG. 19) of the green light quantum dot unit 16 c may not exceed awidth WG′ of the green pixel electrode 13G, and a width WR (see FIG. 19)of the red light quantum dot unit 16 b may not exceed a width WR′ of thered pixel electrode 13R.

Accordingly, light BL passing through the blue pixel electrode 13T maypass through the light transmitter 16 a and be emitted as blue light BL,the light BL passing through the green pixel electrode 13G may passthrough the green light quantum dot unit 16 c and be emitted as greenlight GL, and the light BL passing through the red pixel electrode 13Rmay pass through the red light quantum dot unit 16 b and be emitted asred light RL. However, as described above, because the light transmitter16 a includes the green light quantum dot particles or the greenfluorescent particles, a part of light incident on the light transmitter16 a may be converted into green light to emit blue light mixed withgreen-based light, or the light source 2 may convert a part ofblue-based light into green-based light to emit the blue light mixedwith the green-based light from the light transmitter 16 a.

FIG. 10 is a side view illustrating another example of size relationsbetween a first electrode with a light transmitter, a red light quantumdot unit, and a green light quantum dot unit, and FIG. 11 is a plan viewillustrating another example of the size relations between the firstelectrode and the light transmitter, the red light quantum dot unit, andthe green light quantum dot unit. In the drawings of FIGS. 10 and 11,other components are omitted to show the relations between the firstelectrode 13 and the light transmitter 16 a, the red light quantum dotunit 16 b, and the green light quantum dot unit 16 c.

In the above-described exemplary embodiments of FIGS. 1 to 4, becausethe light transmitter 16 a includes the light converting unit 7 b, suchas the green light quantum dot particles or the green fluorescentparticles, or the light source 2 includes the light converter 2 dconfigured to convert a part of blue-based light BLD into green-basedlight GL0, the blue light mixed with the green-based light may beemitted

According to the example of FIGS. 10 and 11, a width WG of the greenlight quantum dot unit 16 c may extend to cover a part of the blue pixelelectrode 13T. For example, the width WG of the green light quantum dotunit 16 c may extend in a range of 1 to 25% thereof toward the lighttransmitter 16 a. In addition, an area of 1 to 25% of the blue pixelelectrode 13T may be covered by the green light quantum dot unit 16 c.Because the width of the green light quantum dot unit 16 c extendstoward the blue pixel electrode 13T, a width of the light transmitter 16a may decrease.

In this case, a part of the blue light BL passing through the blue pixelelectrode 13T may pass through the light transmitter 16 a and be emittedas the blue light BL, and a part of the rest of the light BL may passthrough the green light quantum dot unit 16 c having the extended widthWG and be emitted as the green light GL. That is, some of the blue lightBL, which is included in a coverage of the green light quantum dot unit16 c, of the blue light BL emitted by the light source 2 and passingthrough the blue pixel electrode 13T is converted into the green lightGL while passing through the green light quantum dot unit 16 c andemitted.

Accordingly, as a result, light passing through the blue pixel electrode13T may be converted into and emitted as blue-based light with an addedgreen color. That is, when an area from which light passing through theblue pixel electrode 13T is emitted is referred to as a blue channelarea, an area from which light passing through the green pixel electrode13G is emitted is referred to as a green channel area, and an area fromwhich light passing through the red pixel electrode 13R is emitted isreferred to as a red channel area, the width of the green light quantumdot unit 16 c extends to cover a part of the blue pixel electrode 13T sothat blue-based light mixed with green-based light may be emitted viathe blue channel area. Even in this case, the descriptions of the otherelements are the same as those described above.

For example, the light transmitter 16 a may include a light transmittingmaterial capable of transmitting all or part of incident light. Here,the light transmitting material may include a material, such as a resin,such as a natural resin or a synthetic resin, a glass, or the like,having a transparency greater than or equal to a predetermined level.The synthetic resin may include an epoxy resin, a urethane resin,polymethyl methacrylate (PMMA), or the like, and the glass may includesilicate glass, borate glass, phosphate glass, or the like.Additionally, any material capable of transmitting various types oflight may be used as the light transmitting material.

In addition, the dispersion particles configured to disperse theincident light in a predetermined range may be disposed in the lighttransmitting material. A material, such as a zinc oxide, a titaniumoxide, and a silicon oxide, may be used as the dispersion particles.

In addition, the light transmitter 16 a may also include a dye whichabsorbs red light or green light. For example, the dye included in thelight transmitter 16 a may transmit blue light and absorb light which isnot the blue color. When the light transmitter 16 a includes a dye whichtransmits blue light and absorbs red light and green light, thegeneration of artifacts due to reflection of external light may bereduced.

Even when the light transmitter 16 a includes a dye, the dispersionparticles may also be included therein to disperse incident light.

FIG. 12A is a view illustrating color gamut for describing a colorreproducing ratio by a display panel, and FIG. 12B is an enlarged viewillustrating an area of the blue family in the color gamut of FIG. 12A.FIG. 12C is a table illustrating an example of locations of red, green,and blue in the color gamut of FIG. 12A. FIG. 13A is a view illustratingcolor gamut for describing a color reproducing ratio by a display panelusing a light converter in a light converting unit or a light source,and FIG. 13B is an enlarged view illustrating an area of the blue familyin the color gamut of FIG. 13A. FIG. 14 is a table illustrating anexample of locations of red, green, and blue in the color gamut of FIG.13A.

FIGS. 12A, 12B, 13A and 13B represent color gamuts, and respectivelyrepresent color areas A1 and B1 (hereinafter, a first color area) bysRGB, color areas A2 and B2 (hereinafter, a second color area) byDCI-P3, a color area A3 (hereinafter, a third color area) which may beacquired using quantum dot sheets, and a color area B3 (hereinafter, afourth color area) which may be acquired by including the green lightconverting unit in the light transmitter 16 a of the quantum dot sheet16 of the display panel 10 or providing the light converter 2 d (shownin FIG. 3) in the light source. An inside of each of the trianglesrepresents an area displayed by a color, and the outside of thetriangles represent an area which is not displayable by a color.

Tables of FIGS. 12C and 14 represent color coordinates in color gamutsof red R, green G, and blue B in each color gamut.

As described above, even when a blue LED is used as the light source inthe case in which the light transmitter 16 a of the quantum dot sheet 16of the display panel 10 includes the green light converting unit, in thecase in which the light source is provided with the light converter 2 d(see FIG. 3), or in the case in which the width of the green lightquantum dot unit 16 c extends to cover a part of the blue pixelelectrode 13T, because blue light itself emitted by the blue LED is notused and the blue light appropriately mixed with green light and is usedto display a color of the blue family, color reproducibility for theblue family can be improved.

Specifically, when the blue light emitted by the blue LED directlypasses though the light transmitter 16 a and is emitted to the outsidewithout an additional conversion process, a color thereof is difficultto accurately represent in sRGB color gamuts A1 and B1 or DCI-P3 colorgamuts A2 and B2, which are generally used for standard colorcoordinates.

As illustrated in FIGS. 12A and 12B, a difference may occur between athird color gamut A3, which is acquirable using a display panel in whicha quantum dot sheet is used, and the first color gamut A1 or the secondcolor gamut A2. In this case, a part of a gamut z3 of the first colorgamut A1 or the second color gamut A2 exists outside the third colorgamut A3.

Thus, some of colors which may be represented in the sRGB color gamutsA1 and B1 or DCI-P3 color gamuts A2 and B2 may not be displayed by thedisplay panel using the quantum dot sheet. In particular, the aboveproblem is significant in a blue color as illustrated in FIGS. 12A to12C. Referring to FIG. 12C, a y-axis coordinate representing a bluecolor B of the display panel using the quantum dot sheet is 0.019, andmay be significantly different from a sRGB y-axis value 0.06 and aDCPI-P3 y-axis value 0.06 corresponding thereto, and thus, the bluecolor of the display panel using the quantum dot sheet may be morevaguely represented.

When the light transmitter 16 a includes the green light convertingunit, when the light source is provided with the light converter 2 d(see FIG. 3), or when the width of the green light quantum dot unit 16 cextends to cover a part of the blue pixel electrode 13T, as illustratedin FIGS. 13A and 13B, the fourth color gamut B3, which is different fromthe third color gamut A3 which may be acquired using the display panelusing the quantum dot sheet, may be acquired.

Specifically, referring to FIG. 14, coordinates of red R and green G inthe fourth color gamut B3 are the same as those of red R and green G inthe third color gamut A3, but coordinates of 0.153 and 0.051 of blue Bin the fourth color gamut B3 are different from coordinates of 0.157 and0.019 of blue B in the third color gamut A3. In other words, the colorgamut of the blue family is changed, and thus, color reproducibility ofthe blue family is also changed.

Referring to FIGS. 13A and 13B, a part of the gamut Z3 existing outsidethe third color gamut A3 exists in the fourth color gamut B3. Thus, inthe case of the display panel 10 in which the light transmitter 16 aincludes the green light converting unit or the light source includesthe light converter, or in the case in which the width of the greenlight quantum dot unit extends to cover a part of the blue pixelelectrode 13T, a color which is not displayed when the display panelusing the quantum dot sheet is used, that is, a color corresponding to apart of the gamut Z3 may be displayed, thereby improving colorreproducibility.

In addition, referring to FIGS. 13A to 13B, the fourth color gamut B3covers most of first color gamuts A1 and B1 of the sRGB color gamuts A1and B1, and is also the same as or similar to second color gamuts A2 andB2 of the DCI-P3 color gamuts A2 and B2. Thus, the display panel 10according to one exemplary embodiment may display all or most of colorsof the sRGB color gamuts A1 and B1 and the DCI-P3 color gamuts A2 andB2. Thus, the most of the colors required for the display apparatusincluding the display panel using the quantum dot sheet may be naturallydisplayed.

Hereinafter, various examples in which a red light quantum dot unit, agreen light quantum dot unit, and a light transmitter are disposed on asubstrate will be described.

FIG. 15 is a view illustrating a first example of a structure in which ared light quantum dot unit, a green light quantum dot unit, and a lighttransmitter are disposed.

Referring to FIG. 15, the light transmitter 16 a (T), the red lightquantum dot unit 16 b (R), and the green light quantum dot unit 16 c (G)may be disposed in one area Z0 of the second substrate 17 in apredetermined pattern. The one area Z0 refers to one polarizing plateformed by combining the light transmitter 16 a, the red light quantumdot unit 16 b, and the green light quantum dot unit 16 c or a portion ofa substrate on which the light transmitter 16 a, the red light quantumdot unit 16 b, and the green light quantum dot unit 16 c are disposed.

The one area Z0 may be divided into a plurality of unit areas Z1 to Z9,and a light transmitter 16 a, a red light quantum dot unit 16 b, and agreen light quantum dot unit 16 c may be disposed in each of the unitareas Z1 to Z9.

Each of the unit areas Z1 to Z9 may form one pixel. The pixel refers toa minimum unit forming an image, and the image may be formed byaggregating light output from the pixels. In the one pixel, light ofdifferent colors may be output, and light of various colors may beexpressed in one pixel by combining the light of different colors.

Patterns on which the light transmitter 16 a, the red light quantum dotunit 16 b, and the green light quantum dot unit 16 c are disposed ineach unit areas Z1 to Z9 may be substantially the same. In other words,the arrangement type in which the light transmitter 16 a, the red lightquantum dot unit 16 b, and the green light quantum dot unit 16 c aredisposed in any one of the unit areas Z1 to Z9 may be the same as thearrangement type in which the light transmitter 16 a, the red lightquantum dot unit 16 b, and the green light quantum dot unit 16 c aredisposed in different unit areas Z1 to Z9.

The unit areas Z1 to Z9 may respectively include a plurality of subareas Z11 to Z93, and the light transmitter 16 a may be disposed in atleast one sub area Z11, Z21, Z31, Z41, Z51, Z61, Z71, Z81, and Z91 amongthe plurality of sub areas Z11 to Z93, and at least one of the red lightquantum dot unit 16 b and the green light quantum dot unit 16 c may bedisposed in different sub areas Z12, Z13, Z22, Z23, Z32, Z33, Z42, Z43,Z52, Z53, Z62, Z63, Z72, Z73, Z82, Z83, Z92, and Z93.

Each of the unit areas Z1 to Z9, as illustrated in FIG. 15, may includethree sub areas among the sub areas Z11 to Z93, and the lighttransmitter 16 a, the red light quantum dot unit 16 b, and the greenlight quantum dot unit 16 c may be sequentially disposed in each of thesub areas Z11 to Z93 in a predetermined sequence. In this case, thesequence of arranging the light transmitter 16 a, the red light quantumdot unit 16 b, and the green light quantum dot unit 16 c may varyaccording to one or more exemplary embodiments.

When the light transmitter 16 a, the red light quantum dot unit 16 b,and the green light quantum dot unit 16 c are disposed in each of theunit areas Z1 to Z9 and the blue light is incident onto the lighttransmitter 16 a, the red light quantum dot unit 16 b, and the greenlight quantum dot unit 16 c, the blue light, red light, and green lightmay be emitted in each of the unit areas Z1 to Z9. The emitted bluelight, the red light, and the green light may solely form a color, orform a color by combining two or more kinds of colored light. Thus, eachof the unit areas Z1 to Z9 may emit light of various colors.

FIG. 16 is a view illustrating a second example of a structure in whicha red light quantum dot unit, a green light quantum dot unit, and alight transmitter are disposed. In FIG. 16, only one unit area Z1 isdescribed, but the red light quantum dot unit, the green light quantumdot unit, and the light transmitter may be disposed in different unitareas Z2 to Z9 as illustrated in FIG. 15.

As illustrated in FIG. 16, one unit area Z1 may include more than threesub areas. For example, FIG. 16 illustrates six sub areas Z11 to Z16separated from each other and arranged in two rows of three sub areas.

At least one of the light transmitter 16 a, red light quantum dot units16 b 1 and 16 b 2, and green light quantum dot units 16 c 1, 16 c 2, and16 c 3 may be disposed in the sub areas Z11 to Z16.

In an exemplary embodiment, as illustrated in FIG. 16, at least one ofthe red light quantum dot units 16 b 1 and 16 b 2, and the green lightquantum dot units 16 c 1, 16 c 2, and 16 c 3 may be disposed in agreater number than the light transmitter 16 a. For example, one lighttransmitter 16 a may be disposed in one unit area Z1, and two red lightquantum dot units 16 b 1 and 16 b 2 may be disposed in the unit area Z1,and three green light quantum dot units 16 c 1, 16 c 2, and 16 c 3 maybe disposed in the unit area Z1.

The light transmitter 16 a, the red light quantum dot units 16 b 1 and16 b 2, and the green light quantum dot units 16 c 1, 16 c 2, and 16 c 3installed in respective sub areas Z11 to Z16 may be in contact with eachother, and may be separated from each other by a predetermined distance.

The light transmitter 16 a, the red light quantum dot units 16 b 1 and16 b 2, and the green light quantum dot units 16 c 1, 16 c 2, and 16 c 3may be disposed in various arrangements based on a particular design.For example, as illustrated in FIG. 16, the light transmitter 16 a maybe disposed in the first sub area Z11, and the green light quantum dotunits 16 c 1, 16 c 2, and 16 c 3 may be disposed in the second sub areaZ12, the fourth sub area Z14, and the fifth sub area Z15, and the redlight quantum dot units 16 b 1 and 16 b 2 may be disposed in the thirdsub area Z13 and the sixth sub area Z16.

Areas of the first red light quantum dot unit 16 b 1, the second redlight quantum dot unit 16 b 2, the first green light quantum dot unit 16c 1, the second green light quantum dot unit 16 c 2, the third greenlight quantum dot unit 16 c 3, and the light transmitter 16 a may be thesame, or some of the areas may be different from each other, or all ofthe areas may be different from each other. The difference of sizesthereof may be determined according to a ratio of amounts of the emittedred light, the green light, and the blue light. For example, when anamount of the emitted green light may be smaller than amounts of thedifferent red light and the blue light, the green light quantum dotunits 16 c 1, 16 c 2, and 16 c 3 emitting the green light may bedisposed in the unit area Z1 in a greater number than the red lightquantum dot units 16 b 1 and 16 b 2 and the light transmitter 16 a.

In another exemplary embodiment, the number of the red light quantum dotunits 16 b 1 and 16 b 2 and the green light quantum dot units 16 c 1, 16c 2, and 16 c 3 disposed in the unit area Z1 may be equal to the numberof the light transmitters 16 a disposed in the unit area Z1.

Although various examples are described above, the light transmitter 16a, the red light quantum dot unit 16 b, and the green light quantum dotunit 16 c may be disposed on the second substrate 17 in variousarrangements, and the arrangement is not limited to the above-discussedexamples.

FIG. 17 is a view illustrating a third example of a structure in which ared light quantum dot unit, a green light quantum dot unit, and a lighttransmitter are disposed, and FIG. 18 is a view illustrating a fourthexample of a structure in which a red light quantum dot unit, a greenlight quantum dot unit, and a light transmitter are disposed.

Referring to FIG. 17, a light transmitter 16 a, a red light quantum dotunit 16 b, and a green light quantum dot unit 16 c may be disposed inone area z0 of a second substrate 17 on the basis of a predeterminedpattern as described above with reference to FIG. 15. Here, asillustrated in FIGS. 10 and 11, the green light quantum dot unit 16 cmay also be disposed to extend toward the light transmitter 16 a tocover a part of an area of a blue pixel electrode 13T.

In this case, even when the light transmitter 16 a does not include agreen light converting unit or when a light converter is not provided ina light source, a part of light passing through the blue pixel electrode13T passes through the green light quantum dot unit 16 c, and light inwhich green-based light and blue-based light are mixed may be emittedfrom a blue channel area.

Referring to FIG. 18, as described six sub areas z11 to z16, which aredivided, and the six areas may be arranged into two rows, each of whichincludes three sub areas.

At least one among the light transmitter 16 a, the red light quantum dotunits 16 b 1 and 16 b 2, and the green light quantum dot units 16 c 1,16 c 2, and 16 c 3 may be disposed in each of the sub areas z11 to z16.Here, as illustrated in FIGS. 10 and 11, the green light quantum dotunit 16 c may also be disposed to extend toward the light transmitter 16a to cover a part of an area of the blue pixel electrode 13T.

In this case, as described above, even when the light transmitter 16 adoes not include the green light converting unit or when the lightconverter is not provided in the light source, a part of light passedthrough the blue pixel electrode 13T may pass through the green lightquantum dot unit 16 c, and thus the light in which the green-based lightand the blue-based light are mixed may be emitted from the blue channelarea.

FIG. 19 is a side cross-sectional view illustrating another exemplaryembodiment of a display panel

As illustrated in FIG. 19, a display panel 10 may include a firstpolarizing filter 11, a first substrate 12, a first electrode 13, asecond electrode 14, a liquid crystal layer 15, a quantum dot sheet 16,a filtering part 16 e, a second substrate 17, and a second polarizingfilter 18.

Because the first polarizing filter 11, the first substrate 12, thefirst electrode 13, the second electrode 14, the liquid crystal layer15, the quantum dot sheet 16, the second substrate 17, and the secondpolarizing filter 18 have already been described, the detaildescriptions thereof will be omitted.

The filtering part 16 e may filter some of light emitted from thequantum dot sheet 16.

Specifically, the filtering part 16 e may be in contact with at leastone emitting surface of a red light quantum dot unit 16 b and a greenlight quantum dot unit 16 c. In this case, the filtering part 16 e mayalso be disposed on each of the red light quantum dot unit 16 b and thegreen light quantum dot unit 16 c, and when the filtering part 16 e isdisposed on each of the red light quantum dot unit 16 b and the greenlight quantum dot unit 16 c, one filtering part 16 e may be disposed onboth of the red light quantum dot unit 16 b and the green light quantumdot unit 16 c.

According to one exemplary embodiment, the filtering part 16 e mayinclude a blue light cut-off filter configured to filter blue-basedlight. A cut-off filter is a filter configured to filter light in apredetermined wavelength range and transmit the remaining light, whichis not in the predetermined wavelength range, and a blue light cut-offfilter is a filter configured to filter blue-based light and transmitgreen-based light or red-based light. The filtering part 16 e may beformed in a film form.

The red light quantum dot unit 16 b and the green light quantum dot unit16 c may emit some of the blue-based light. Specifically, some of theblue-based light incident on the red light quantum dot unit 16 b may notencounter a red light quantum dot particles, may pass through the redlight quantum dot unit 16 b, and may be emitted. In this case, thetransmitted blue-based light may affect a color of red-based lightemitted from the red light quantum dot unit 16 b, thereby decreasingcolor reproducibility. Because the filtering part 16 e is disposed onthe emitting surface of the red light quantum dot unit 16 b, thefiltering part 16 e may remove the blue-based light emitted from the redlight quantum dot unit 16 b to allow the red-based light to be emittedfrom the red light quantum dot unit 16 b. Similarly, the filtering part16 e may remove the blue-based light emitted from the green lightquantum dot unit 16 c to allow green-based light to be emitted from thegreen light quantum dot unit 16 c.

Hereinafter, various exemplary embodiments of display apparatuses usedin display panels will be described with reference to FIGS. 20 to 29.

FIG. 20 is a perspective view illustrating an exterior of an exemplaryembodiment of a display apparatus.

As illustrated in FIG. 20, a display apparatus 90 may include anexternal housing 91, an image display part 97, a support 98, and a leg99.

The external housing 91 forms an exterior of the display apparatus 90,and includes components configured to display various images by thedisplay apparatus 90 or perform various operations thereof. The externalhousing 91 may be integrally formed, and may be a combination of aplurality of housings, for example, a front housing 101 (shown in FIG.22) and a rear housing 102 (shown in FIG. 22). A middle housing 103(shown in FIG. 22) may be further provided in the external housing 91.

The image display part 97 may be installed on a front of the externalhousing 91 and display various images to the outside. In particular, theimage display part 97 may display at least one of a still image ormoving image. The image display part 97 may be realized using a displaypanel 95, and may include additional parts such as a touch panel, and/orthe like.

The support 98 supports the external housing 91 and serves to connectthe external housing 91 to the leg 99. The support 98 may have variousshapes or omitted. The support 98, according to requirements, may beattached to or detached from the external housing 91.

The leg 99 is connected to the support 98 and the external housing 91may be stably disposed on a floor. The leg 99, according torequirements, may be combined with or separated from the support 98. Theleg 99 may be directly connected to the external housing 91. The leg 99may be omitted in some exemplary embodiments.

FIG. 21 is a structural view illustrating an exemplary embodiment of adisplay apparatus.

As shown in FIG. 21, a display apparatus 90, in an exemplary embodiment,may include a controller 92, a power supply part 93, a backlight unit94, and a display panel 95.

The controller 92 may control the power supply part 93, the displaypanel 95, and/or the like, and thus, the display panel 95 may display apredetermined still image or moving image. The controller 92 may berealized by a processor, and the processor may be realized using one ormore semiconductor chip and various components configured to operate thesemiconductor chip. Meanwhile, the display apparatus 90 may furtherinclude a storage device configured to store various types of data inorder to support the operation of the processor, and the storage mediamay be realized using semiconductor storage devices such as arandom-access memory (RAM) or read-only memory (ROM), magnetic diskstorage devices such as a hard disk, and/or the like.

The power supply part 93 may supply electric power required to output apredetermined image to the backlight unit 94, the display panel 95,and/or the like. The power supply part 93 may be electrically connectedto an external commercial power source 96. The power supply part 93 mayrectify an alternating current (AC) power source from the externalcommercial power source 96 into a direct current (DC) power sourcerequired to operate the display apparatus 90, or change a voltage to arequired level, or perform an operation of removing noise from the DCpower source. In some exemplary embodiments, the power supply part 93may include a battery capable of storing electric power.

The backlight unit 94 generates light based on input electric power, andradiates the light in a direction toward the display panel 95. Thebacklight unit 94 may be realized using a light emitting unit such as alight emitting diode (LED) configured to emit light based on appliedpower, and may further include a diffusion sheet, a light guide plate,and/or the like, and thus, the emitted light is sufficiently incidentonto all of a surface of the display panel 95. When the display panel 95is a self-emissive type such as an organic light emitting diode (OLED)display panel, the backlight unit 94 may be omitted. The detaileddescription of the backlight unit 94 will be described below.

The display panel 95 may generate an image using the incident light. Insome exemplary embodiments, the display panel 95 may control emittinglight using liquid crystals, and also, the display panel 95 may furtheruse a quantum dot sheet 118 (shown in FIG. 18) and emit light of aparticular color. Also, the display panel 95 may generate and emit lightby itself, and, in this case, the backlight unit 94 may be omitted. Whenthe display panel 95 is a self-emissive type, the display panel 95 mayuse an OLED or an active matrix OLED and generate light in theself-emissive type. The detailed description of the display panel 95will be described below.

FIG. 22 is an exploded perspective view illustrating a first exemplaryembodiment of a display apparatus, and FIG. 23 is a side cross-sectionalview illustrating the first exemplary embodiment of the displayapparatus. FIG. 24 is a view illustrating a blue light emitting diodeillumination lamp as an exemplary embodiment of a light source of thedisplay apparatus, and FIG. 25 is a side cross-sectional viewillustrating a display panel according to a first exemplary embodimentof the display apparatus. Hereinafter, for convenience of description,upward directions of FIGS. 22 and 23 are referred to as forwarddirections, and downward directions of FIGS. 22 and 23 are referred toas rearward directions.

In the first exemplary embodiment, the display apparatus 100, asillustrated in FIGS. 22 and 23, may include housings 101 and 102configured to form an exterior, a display panel 110 configured togenerate an image, and a backlight unit (BLU) 120 configured to supplylight to the display panel 110.

In an exemplary embodiment, the housings 101 and 102 may include a fronthousing 101 installed in the forward direction, a rear housing 102installed in the rearward direction, and the display panel 110 mayinclude a second polarizing filter 111, a second substrate 112, aquantum dot sheet 118, a second electrode 113, a first electrode 115, afirst substrate 116, and a first polarizing filter 117, and the BLU 120may include an optical plate 121, a diffusion plate 125, a reflectingplate 130, and a light emitter 140. According to one or more exemplaryembodiments, one or more of the above-discussed elements may be omitted,and also additional components, for example, a touch screen panel,and/or the like may be added.

The front housing 101 may be disposed in the most forward direction ofthe display apparatus 100, and form an exterior of a front surface and aside surface of the display apparatus 100. The front housing 101 may becombined with the rear housing 102 to include and fix various types ofcomponents of the display apparatus 100 in the display apparatus 100.The front housing 101 may stabilize the various components included inthe display apparatus 100, and simultaneously protect the componentsfrom a direct impact of the outside.

The front housing may include a fixing part 101 b forming a bezel and aside part 101 a extending from an end portion of the fixing part 101 bin a direction toward the rear housing 102. An opening 101 c is definedby the front of the front housing 101.

The side part 101 a may be combined with the rear housing 102, and thefront housing 101 may be combined with the rear housing 102. The sidepart 101 a may fix various types of components in the display apparatus100, and protect the various types of components included in the displayapparatus 100 from an impact transmitted in a sideward direction.

The fixing part 101 b may protrude in a direction toward the opening 101c, and fix various types of components such as the second polarizingfilter 111, the second substrate 112, and the quantum dot sheet 118, andprevent the dislocation of the various types of components to theoutside or partial exposure thereof.

The image formed by the light passed through the second polarizingfilter 111 is displayed through the opening 101 c, and thus, a user mayview the image.

The rear housing 102 may be disposed in the rearmost direction of thedisplay apparatus 100, and may form an exterior of the rear surface andthe side surface of the display apparatus 100. The rear housing 102 maybe combined with the front housing 101, and the various types ofcomponents of the display apparatus 100 are included in the displayapparatus 100. In some exemplary embodiments, the front housing 101 andthe rear housing 102 may be integrally formed.

The light emitter 140 and the reflecting plate 130 may be fixedlyinstalled on an inside surface of the rear housing 102.

The light emitter 140 may include a light source 142 for emitting lightand a third substrate 141 on which the light source 142 is mounted.

A plurality of the light sources 142 may be installed on the thirdsubstrate 141 in a predetermined pattern. For example, the plurality oflight sources 142 may be installed on the third substrate 141 in astraight-line form or various forms. Also, according to another example,only one light source 142 may be installed on the third substrate 141. Adriving power line configured to supply a driving power to the lightsource 142, and/or the like may be formed on the third substrate 141,and the light source 142 may be connected to a signal cable and abacklight driving circuit through the driving power line. The thirdsubstrate 141 may be manufactured using various materials such as asynthetic resin, and/or the like, and in some exemplary embodiments, mayinclude a transparent material such as a poly methylmethacrylate resin,a glass plate, and/or the like.

The light sources 142 may be arranged and installed on the thirdsubstrate 141 in a predetermined pattern, and at least one thereof maybe provided. In this case, the predetermined pattern in which the lightsources 142 are disposed may correspond to the arrangement pattern ofquantum dot units in the quantum dot sheet 118. However, the arrangementpattern of the light source 142 is not limited thereto, and the lightsources 142 may be disposed on the third substrate 141 in variouspatterns.

The light source 142 may radiate light of a predetermined color invarious directions. Here, the light of the predetermined color mayinclude blue-based light. The blue-based light may have a wavelength ina range of 400 nm to 500 nm, and refers to light optically viewed as ablue color. In order to emit the blue-based light, the light source 142may be realized using a blue light emitting diode.

The light source 142, for example, may include a light bulb, a halogenlamp, a fluorescent lamp, a sodium lamp, a mercury lamp, a fluorescentmercury lamp, a xenon lamp, an arc illumination lamp, a neon tube lamp,an EL lamp, an LED lamp, and/or the like, and additionally, variousillumination devices may be included in the light source 142.

Hereinafter, an example of the light source 142 will be described indetail.

In an exemplary embodiment, as illustrated in FIG. 24, the light source142 may include a light emitting unit 144 and a transparent body 145.

The light emitting unit 144 may include a positive electrode frame 144a, an LED reflecting plate 144 b, a negative electrode frame 144 c, anda light emitting chip.

The positive electrode frame 144 a and the negative electrode frame 144c are electrically connected to external electric power through portions146 a and 146 b exposed to the outside, respectively. When the externalelectric power is applied, a current flows from the positive electrodeframe 144 a to the negative electrode frame 144 c through the lightemitting chip installed on the negative electrode frame 144 c with theLED reflecting plate 144 b.

The light emitting chip may be realized using a PN junction diode. Thelight emitting chip may be electrically connected to the positiveelectrode frame 144 a and the negative electrode frame 144 c through aplurality of electrodes, and generate and emit light based on thecurrent applied to the positive electrode frame 144 a and the negativeelectrode frame 144 c. In this case, the emitted light may be theblue-based light. In an exemplary embodiment, the light emitting chipmay be realized using gallium nitride (GaN), aluminum gallium nitride(AlGaN), indium gallium nitride (InGaN), and/or the like. The lightemitting chip may be installed on an inner surface of the LED reflectingplate 144 b.

The LED reflecting plate 144 b may reflect light emitted from the lightemitting chip, and the emitted light may proceed in a predetermineddirection. For example, the LED reflecting plate 144 b may move thelight in a direction toward the transparent body 145. The LED reflectingplate 144 b may be formed of a material capable of easily reflecting thelight emitted from the light emitting chip.

The transparent body 145 may be formed of a material capable oftransmitting light such as a synthetic resin, acrylic resin, etc.,glass, and/or the like, and may be manufactured in various shapes. Inparticular, as illustrated in FIG. 24, the transparent body 145 may havea shape of a semi-sphere formed on a cylinder. A lens may be provided onone end of the transparent body 145, and the lens may have thehemispherical shape.

The positive electrode frame 144 a, the LED reflecting plate 144 b, thenegative electrode frame 144 c, the light emitting chip, and/or the likemay be fixedly installed in an inner space 143 of the transparent body145.

In an exemplary embodiment, a light converter 145 a configured toconvert a color of the emitted light into a different color may beprovided in the transparent body 145.

As described above, the light converter 145 a may include a green lightconverting unit, and the green light converting unit, for example, mayinclude a green quantum dot particle or a green fluorescent particle.The green quantum dot particle or the green fluorescent particle mayfloat in the inner space 143 of the transparent body 145 in the form ofa droplet.

The green quantum dot particle, as described above, refers to asemiconductor crystal having a size of about 2 nm to 3 nm, and the greenfluorescent particle changes a wavelength of the incident light toconvert light of a predetermined color into green-based light. In anexemplary embodiment, the green fluorescent particle may include a greenfluorescent body having a maximum width of 540 nm or less.

In an exemplary embodiment, all of the green quantum dot particles andthe green fluorescent particles may be used as the green lightconverting unit, and in this case, the green quantum dot particles andthe green fluorescent particles may exist in the transparent body 145 ata predetermined ratio, which may vary according to various exemplaryembodiments.

When the blue-based light is emitted from the light emitting chip, thelight converter 145 a may convert a part of blue-based light into thegreen-based light, and thus, as illustrated in FIG. 4, the light source142 may emit a mixture of the blue-based light and the green-basedlight. Thus, the light L emitted from the light source 142 by the lightconverter 145 a may be closer to a green color than the blue-based lightemitted from a blue light emitting diode. Thus, as described above,color reproducibility generated by the color of the light emitted fromthe blue light emitting diode may be improved.

As illustrated in FIG. 25, in some exemplary embodiments, the lightconverter 145 a may be omitted. In this case, the above light convertingunit may be provided in the light transmitter 118 a.

The light radiated from the light source 142 may be directly radiated inthe forward direction which is a direction toward the diffusion plate125, or reflected by the reflecting plate 130 and then radiated in theforward direction.

The reflecting plate 130 may be installed on the rear housing 102, andreflect the light, which is emitted from the light source 142 andproceeds in the rearward direction or the sideward direction, in theforward direction or a similar direction thereto.

In an exemplary embodiment, at least one through-hole 132 into which thelight source 142 is inserted and installed may be provided through thereflecting plate 130, and in this case, the light source 142 may beinstalled by being inserted into the through-hole 132 in the rearwarddirection of the reflecting plate 130 and is exposed in a directiontoward a reflecting surface 131. Also, in some exemplary embodiments,the through-hole 132 may not be installed through the reflecting plate130, and in this case, the light source 142 may be installed on thereflecting surface 131 of the reflecting plate 130, and may be installedon an additional substrate including a transparent material whichtransmits light.

The reflecting plate 130 may be manufactured using a synthetic resinsuch as polycarbonate (PC), polyethylene terephthalate (PET), and/or thelike, and also, may be manufactured with various metals. Additionally,the reflecting plate 130 may be manufactured with various materials.

At least one optical plate 121 and at least one diffusion plate 125 maybe provided in the forward direction of the reflecting plate 130. Thelight emitted from the light source 142 or the light reflected from thereflecting plate 130 may be incident onto at least one diffusion plate125.

The diffusion plate 125 may serve to diffuse incident light. Thediffusion plate 125 may diffuse the incident light and disperse thelight radiated from the light source 142 in various directions. Thelight radiated from the light source 142 may pass through the diffusionplate 125 and be incident onto the optical plate 121.

The optical plate 121, for example, may include at least one diffusionsheet 122, at least one prism sheet 123, and at least one protectionsheet 124. The diffusion sheet 122, the prism sheet 123, and theprotection sheet 124 may be formed in a film shape.

The diffusion sheet 122 may serve to offset a pattern of the diffusionplate 125. Because the light dispersed by the diffusion plate 125 isdirectly incident onto the eyes, the pattern of the diffusion plate 125is viewed by the eyes, and thus, the diffusion sheet 122 may offset orminimize the pattern of the diffusion plate 125.

The prism sheet 123 may refract the light diffused by the diffusionsheet 122 and the light is incident onto the first substrate 116 in thevertical direction. Prisms may be arranged on one surface of the prismsheet 123 in a predetermined pattern. In an exemplary embodiment, aplurality of the prism sheets 123 may be provided.

The protection sheet 124 may be disposed adjacent to the firstpolarizing filter 117, and protect the diffusion sheet 122, the prismsheet 123, and/or the like from an external impact or contaminants.

The optical plate 121, as described above, may be formed to include thediffusion sheet 122, the prism sheet 123, and the protection sheet 124,or may be formed by omitting one or more of them, or may be formed toinclude more sheets additionally. Also, the optical plate 121 may beformed using a complex sheet in which functions of the above sheets areincluded.

The light passed through the optical plate 121 may be incident onto thefirst polarizing filter 117.

The middle housing 103 may be provided between the optical plate 121 andthe first polarizing filter 117. The middle housing 103 may fix the BLU120, or partition the display panel 110 from the BLU 120. The middlehousing 103 may include a protrusion protruding in a direction towardthe display panel 110 and the BLU 120, and the BLU 120 may be fixed bythe protrusion. The middle housing 103 may be integrally formed with thefront housing 101 or the rear housing 102. The middle housing 103 may beomitted in some exemplary embodiments.

The first polarizing filter 117 may polarize light incident onto thefirst substrate 116 from the light source 142, and the light vibratingin the same direction as a predetermined polarizing axis may be incidentonto the first substrate 116. One surface of the first polarizing filter117, as illustrated in FIGS. 22 and 23, may be in contact with oradjacent to a rear surface of the first substrate 116. The firstpolarizing filter 117 may be formed in a film shape. In an exemplaryembodiment, the first polarizing filter 117 may include a verticalpolarizing filter or a horizontal polarizing filter. Here, the verticaldirection refers to a direction parallel with a line segment verticallypassing through an upper interface and a lower interface of the displayapparatus, and the horizontal direction refers to a direction parallelwith the upper interface and the lower interface.

The first electrode 115 may be installed on one surface of the firstsubstrate 116 in the forward direction, and the first polarizing filter117 may be installed on one surface in the rearward direction. The firstsubstrate 116 may be formed of a transparent material through which thelight passed through the first polarizing filter 117 in the rearwarddirection is transmitted. For example, the first substrate 116 may berealized using a synthetic resin such as an acrylic resin, and/or thelike, or glass and/or the like. The first substrate 116, in someexemplary embodiments, may include a FPCB.

The first electrode 115 may apply a current to a liquid crystal layer114 along with the second electrode 113 to adjust an arrangement of theliquid crystal molecules 114 a in the liquid crystal layer 114.According to the arrangement of the liquid crystal molecules 114 a, thedisplay panel 110 may display various images.

In an exemplary embodiment, the first electrode 115 may be realizedusing a TFT. The first electrode 115 may be connected to externalelectric power, and receive electric power. A plurality of the firstelectrodes 115 may be installed on the first substrate 116, and thefirst electrodes 115 may be installed on the first substrate 116 in apredetermined pattern. The pattern of the first electrodes 115 may varyaccording to one or more exemplary embodiments.

The second electrode 113 may be provided to correspond to the firstelectrode 115 with respect to the liquid crystal layer 114, and mayserve to apply a current to the liquid crystal layer 114 along with thefirst electrode 115. One surface of the second electrode 113 in theforward direction may be in contact with the quantum dot sheet 118, andone surface in the rearward direction may be in contact with or adjacentto the liquid crystal layer 114. The second electrode 113 may be acommon electrode.

The liquid crystal layer 114 may be provided between the secondelectrode 113 and the first electrode 115, and the liquid crystal layer114 may include a plurality of liquid crystal molecules 114 a.

The liquid crystal molecules 114 a, as described above, may be arrangedin a plurality of columns in the liquid crystal layer 114, and may bealigned in a predetermined direction or twisted in a spiral shape basedon an electrical field.

When the liquid crystal molecules 114 a are aligned in a straight line,a vibration direction of the light polarized by the first polarizingfilter 117 is not changed and the light passes through the liquidcrystal layer 114, and when the liquid crystal molecules 114 a aretwisted and arranged in the spiral shape, the vibration direction of thepolarized light is converted in a direction perpendicular into anoriginal vibration direction and the light passes through the liquidcrystal layer 114. When a polarizing axis of the second polarizingfilter 111 is different from that of the first polarizing filter 117,the light passed through the liquid crystal layer 114 without the changeof the vibration direction may not pass through the second polarizingfilter 111, and the light passed through the liquid crystal layer 114and polarized in the horizontal direction may pass through the secondpolarizing filter 111. A part of the light passed through the liquidcrystal layer 114 may pass through the second polarizing filter 111 andbe emitted to the outside, but the remaining light may be blocked by thesecond polarizing filter 111 and may not be emitted to the outside.

The quantum dot sheet 118 may convert the incident light of apredetermined color into a different color, or may output withoutconverting into the different color. When blue-based light is incident,the quantum dot sheet 118 may directly transmit and emit the blue-basedlight, or may convert the blue-based light into red-based light orgreen-based light and emit the converted light. By the quantum dot sheet118, the display panel 110 may emit light of various colors to theoutside, and thus, the display apparatus 100 may display various colorson a screen.

One surface of the quantum dot sheet 118 in the rearward direction, inan exemplary embodiment, may be provided to contact the second electrode113, and one surface in the forward direction may be in contact with thesecond substrate 112.

The quantum dot sheet 118 may include a light transmitter 118 aconfigured to transmit the blue-based light, at least one red lightquantum dot unit 118 b configured to convert the incident blue-basedlight into red light, and at least one green light quantum dot unit 118c configured to convert the incident blue-based light into green light.

The light transmitter 118 a, the red light quantum dot unit 118 b, andthe green light quantum dot unit 118 c, as illustrated in FIG. 19, maybe provided to correspond to one group of liquid crystal molecules ofthe liquid crystal layer 114. In particular, one group of liquid crystalmolecules 114 a may be provided to correspond to one light transmitter118 a, and another group of liquid crystal molecules 114 a may beprovided to correspond to one red light quantum dot unit 118 b, andstill another group of liquid crystal molecules 114 a may be provided tocorrespond to one green light quantum dot unit 118 c.

The light transmitter 118 a may not change a part of the incidentblue-based light, and directly emit to the outside, and another part maybe converted into the green-based light and emitted. In particular, thelight transmitter 118 a may include a main body and light convertingunits disposed in the main body, and in an exemplary embodiment, mayfurther include dispersion particles disposed in the main body.

The light converting unit may change the color of the light incidentonto the main body and emit in a direction toward the second substrate112. For example, when the incident light is the blue-based light, thelight converting unit may convert the blue-based light into thegreen-based light or the red-based light and emit. In an exemplaryembodiment, the light converting unit may include the green lightconverting unit configured to convert the blue-based light into thegreen-based light, and here, the green light converting unit may includeat least one of the above green quantum dot particle and the greenfluorescent particle. The light converting unit may be omitted when thelight converter 145 a is provided in the light source 142.

The dispersion particle may disperse the incident blue-based light andemit in a direction toward the second substrate 112. Thus, the bluelight transmitted and emitted from the second polarizing filter 111 andthe second substrate 112 may be dispersed similar to the above-discussedred-based light and the green-based light, and may be viewed in aviewing angle similar thereto. The dispersion particle may use zincoxide, titanium oxide, silicon oxide, and/or the like.

Because the converting unit and the dispersion particle are describedwith reference to FIGS. 1 and 2, the detailed description thereof willbe omitted.

The red light quantum dot unit 118 b and the green light quantum dotunit 118 c may convert the blue-based light radiated from the lightsource 142 using a quantum dot into the red-based light or green-basedlight, and emit in a direction toward the second substrate 112. Thequantum dot of the red light quantum dot unit 118 b may be relativelylarger than the quantum dot of the green light quantum dot unit 118 c.The light emitted from the red light quantum dot unit 118 b and thegreen light quantum dot unit 118 c may be dispersed and emitted.

The light transmitter 118 a may be relatively smaller than at least oneof the red light quantum dot unit 118 b and the green light quantum dotunit 118 c. For example, the light transmitter 118 a may have a widthsmaller than at least one of the red light quantum dot unit 118 b andthe green light quantum dot unit 118 c.

The light transmitter 118 a, the red light quantum dot unit 118 b, andthe green light quantum dot unit 118 c may be in contact with eachother, or may be spaced apart from each other by a predetermineddistance. When the light transmitter 118 a, the red light quantum dotunit 118 b, and the green light quantum dot unit 118 c are spaced apartfrom each other, a partition wall may be provided therebetween.

The red light quantum dot unit 118 b and the green light quantum dotunit 118 c may be provided in a larger number in the quantum dot sheet118 than in the light transmitter 118 a. For example, as describedabove, the red light quantum dot unit 118 b and the green light quantumdot unit 118 c may be disposed in a larger number than in the lighttransmitter 118 a in at least one unit area in the quantum dot sheet118.

The red light quantum dot unit 118 b, the green light quantum dot unit118 c, and the light transmitter 118 a are already described above, andthus, the detailed description thereof will be omitted.

In an exemplary embodiment, a filtering part 118 d configured to filtera part of the emitted light may be provided on one surface of the redlight quantum dot unit 118 b and the green light quantum dot unit 118 cin the forward direction. The filtering part 118 d may be formed in afilm shape. In an exemplary embodiment, the filtering part 118 d mayfilter the blue-based light which is not changed by the red lightquantum dot unit 118 b and the green light quantum dot unit 118 c. Whenthe filtering part 118 d filters the blue-based light, the filteringpart 118 d may be realized using a blue light cut-off filter. Onesurface of the filtering part 118 d, facing the rearward direction, maybe in contact with or adjacent to at least one of the red light quantumdot unit 118 b and the green light quantum dot unit 118 c. Anothersurface of the filtering part 118 d, facing the forward direction, maybe installed to be in contact with or adjacent to the second substrate112.

The quantum dot sheet 118 may be installed on one surface of the secondsubstrate 112 in the rearward direction, and the second polarizingfilter 111 may be installed on one surface in the forward direction. Inan exemplary embodiment, a filtering part 118 d may be installed on thesurface of the second substrate 112.

In particular, red light quantum dot units, green light quantum dotunits, and light transmitters may be installed on the second substrate112 in predetermined patterns, respectively. In this case, the secondsubstrate 112 may be divided into a plurality of unit areas, and in eachunit area, the red light quantum dot units, the green light quantum dotunits, and the light transmitters may be installed in the same pattern.Each of the unit areas may include a plurality of sub areas. One of thered light quantum dot unit, the green light quantum dot unit, and thelight transmitter may be respectively installed in each sub area.

The second substrate 112 may be formed of a transparent material totransmit red light, green light, and blue light emitted from the quantumdot sheet 118, and for example, may be manufactured using a syntheticresin such as an acrylic resin, and/or the like or glass and/or thelike.

The second polarizing filter 111 may be installed on one surface of thesecond substrate 112 in the forward direction, and may polarize incidentlight. The light passed through and emitted from the second substrate112, for example, red-based light, green-based light, and blue-basedlight, may be incident onto the second polarizing filter 111, and may betransmitted by the second polarizing filter 111 or be blocked by thesecond polarizing filter based on a vibration direction.

A polarizing axis of the second polarizing filter 111 may beperpendicular to a polarizing axis of the first polarizing filter 117,and thus, when the first polarizing filter 117 is a vertical polarizingfilter, the second polarizing filter 111 may be a horizontal polarizingfilter.

When the polarizing axis of the second polarizing filter 111 isperpendicular to the polarizing axis of the first polarizing filter 117,and the liquid crystal molecules 114 a of the liquid crystal layer 114are aligned in a straight line to transmit the light passed through thefirst polarizing filter 117, the vibration direction of the light passedthrough the first polarizing filter 117 is not changed, and may not passthrough the second polarizing filter 111, and thus, the light passedthrough the second substrate 112 may not be emitted to the outside. Incontrast, when the liquid crystal molecules 114 a of the liquid crystallayer 114 are aligned in a spiral shape and transmit the light passedthrough the first polarizing filter 117, the vibration direction of thelight passed through the first polarizing filter 117 may be changed andmay pass through the second polarizing filter 111. Thus, the lightpasses through the second substrate 112, for example, and at least oneof the red-based light, the green-based light and the blue-based lightmay be emitted to the outside.

By controlling emission of the red-based light, the green-based light,and the blue-based light to the outside, colors may be formed bycombining the emitted lights, and the display apparatus 100 may displaya predetermined image using at least one of the above red-based light,the green-based light, and the blue-based light.

Hereinbefore, the display apparatus 100 according to the exemplaryembodiment is described, but various components may be added to theabove described components. For example, a fourth substrate on whichvarious components configured to control various operations of thedisplay apparatus 100 may be further provided. Here, the variouscomponents, for example, may include a processor or a storage devicerealized by one or two or more semiconductor chips, various circuits, orvarious components configured to support the operation of the processor.The fourth substrate may be installed on various positions, for example,the fourth substrate may be fixedly installed inside the rear housing102. Additionally, various other components may be provided on thedisplay apparatus 100.

FIG. 26 is an exploded perspective view illustrating a second exemplaryembodiment of a display apparatus, and FIG. 27 is a side cross-sectionalview illustrating the second exemplary embodiment of the displayapparatus.

According to the second exemplary embodiment of the display apparatus200 as shown in FIGS. 26 and 27, the display apparatus 200 may includehousings 201 and 202 configured to form an exterior, a display panel 210configured to generate an image, and a BLU 220 configured to supplylight to the display panel 210.

Specifically, the housings 201 and 202 may include a front housing 201installed in the forward direction, a rear housing 202 installed in therearward direction, and the display panel 210 may include a secondpolarizing filter 211, a second substrate 212, a quantum dot sheet 218,a second electrode 213, a first electrode 215, a first substrate 216,and a first polarizing filter 217, and the BLU 220 may include anoptical plate 221, a diffusion plate 225, a fourth substrate 230, alight source 231, a light guide plate 232, and a reflecting plate 233.According to one or more exemplary embodiments, one or more of thesecomponents may be omitted.

The front housing 201 may be disposed in the most forward direction ofthe display apparatus 200, and the rear housing 202 may be disposed inthe most rearward direction of the display apparatus 200, and both ofthem are combined to form an exterior of the display apparatus 200. Thefront housing 201 may include a fixing part 201 b for forming a bezeland a side part 201 a extended from an end portion of the fixing part201 b in a direction toward the rear housing 202. An opening 201 c maybe defined by a front of the front housing 201.

The fourth substrate 230 may be installed inside the rear housing 202.The fourth substrate 230 applies an electric signal to the light source231, and the light source 231 may radiate light of a predeterminedwavelength. Various components configured to control the light source231 may be provided on the fourth substrate 230. Also, a processorand/or the like configured to various operations of the displayapparatus in addition to the light source may be installed on the fourthsubstrate 230. The processor may be realized by one or two or moresemiconductor chips and related components.

A spacer configured to protect one surface of the fourth substrate 230may be provided on the fourth substrate 230. The reflecting plate 233and the light guide plate 232 may be sequentially installed in a forwarddirection of the spacer.

The light source 231 may be installed on the fourth substrate 230, andemit light of a predetermined color in a sideward direction of the lightguide plate 232. Here, the light of a predetermined color may includeblue-based light. The light source 231 may be installed on the sidesurface of the light guide plate 232 to be separated from the lightguide plate 232. The light source 231 may be installed along the sidesurface of the light guide plate 232 on at least one end of the fourthsubstrate 230 in a straight line, or may be installed in two columnsalong both side surfaces of the light guide plate 232.

In some exemplary embodiments, the light source 231 may be directlyinstalled on the fourth substrate 230, or installed on a holderadditionally provided on the fourth substrate 230.

As illustrated in FIG. 27, light RL1 and RL2 radiated from the lightsources 231 may be incident onto the light guide plate 232 through theside surfaces of the light guide plate 232, respectively. The lightincident onto the light guide plate 232 may be totally reflected andtransmitted in the light guide plate 232, and thus, the light may beuniformly incident onto one surface of the display panel 210.

The light source 231 may include a light bulb, a halogen lamp, afluorescent lamp, a sodium lamp, a mercury lamp, a fluorescent mercurylamp, a xenon lamp, an arc illumination lamp, a neon tube lamp, an ELlamp, an LED lamp, and/or the like, and additionally, variousillumination devices may be included in the light source 231.

As illustrated in FIG. 24, the light source 231 may include the lightconverter 145 a, and when the light source 231 uses a blue lightemitting diode, the light converter 145 a may include a green lightconverting unit. The green light converting unit, for example, mayinclude a green quantum dot particle, or a green fluorescent particle.In this case, the blue-based light may be mixed with the green-basedlight in the light source 231 and emitted, and thus, colorreproducibility generated by the color of the light emitted from theblue light emitting diode may be improved. In some exemplaryembodiments, the light source 231 may not include the light converter145 a. The light source 231 is described in detail with reference toFIG. 24, and thus, the detailed description thereof will be omitted.

A spacer may be installed on one surface of the fourth substrate 230 andprotrude in the forward direction, and may prevent various componentssuch as a semiconductor chip installed on the fourth substrate 230 fromdirectly contacting the reflecting plate 233. Thus, damage of thecomponents installed on the fourth substrate 230, the reflecting plate170, and/or the like may be prevented.

The reflecting plate 233 may be installed on one surface of the spacerin a forward direction, and reflect a part RL1 and RL2 of the lightproceeding in the light guide plate 232 in the rearward direction towardthe forward direction or a direction similar thereto. Thus, the lightradiated from the light source 231 may proceed in a direction toward thedisplay panel 210. The reflecting plate 233, as described above, may bemanufactured using a synthetic resin such as PET, PC, and/or the like.Additionally, the reflecting plate 233 may be manufactured using variousmaterials.

The light guide plate 232 may reflect the light RL1 and RL2 internallyemitted from the light source 231 one or more times, and the lightemitted from the light source 231 may be uniformly supplied to thedisplay panel 210. The light radiated from the light source 231 isincident onto the side surface of the light guide plate 232. The displaypanel 210, the diffusion plate 225, or the optical plate 221 may bedisposed to be in contact with the one surface of the light guide plate232 in the forward direction, and the reflecting plate 233 may beattached to one surface in the rearward direction. The light guide plate232 may be manufactured using a material having high light transmission,and for example, may be manufactured using PMMA, and/or the like.

At least one of the diffusion plate 225 and the optical plate 221 may bedisposed between the display panel 210 and the light guide plate 232.

The diffusion plate 225 may serve to diffuse incident light. Thediffusion plate 225 may diffuse the incident light and may serve touniformly disperse the light radiated from the light source 231 invarious directions.

The optical plate 221, for example, may include at least one diffusionsheet 222, at least one prism sheet 223, and at least one protectionsheet 224. These are similar to the diffusion sheet 122, the prism sheet123, and the protection sheet 124 described above, and thus, thedetailed description thereof will be omitted.

The diffusion plate 225 and the optical plate 221 may be omittedaccording to an exemplary embodiment, and may be substituted by a filmor a substrate of a different type.

The light passed through the diffusion plate 225 and the optical plate221 may be incident onto the rear surface of the display panel 210.

A middle housing 203 configured to fix the display panel 210 or the BLU220, or separate the display panel 210 and the BLU 220 may be furtherprovided between the display panel 210 and the BLU 220. The middlehousing 203 may be omitted according to an exemplary embodiment.

The display panel 210 may convert the incident light of a predeterminedcolor into light of a different color or emit without conversion intothe different color. The display panel 210, as illustrated in FIGS. 26and 27, may include the first polarizing filter 217, the first substrate216, the first electrode 215, the second electrode 213, a liquid crystallayer 214, the quantum dot sheet 218, the second substrate 212, and thesecond polarizing filter 211.

The first polarizing filter 217 polarizes the light incident from thelight source 231 on the first substrate 216, and only a part of lightvibrating in a direction the same as a predetermined polarizing axis maybe incident onto the first substrate 216.

The first electrode 215 may be installed on the first substrate 216. Thefirst substrate 216 may transmit the light passed through the firstpolarizing filter 217 to the liquid crystal layer 214.

The liquid crystal layer 214 may transmit the light passed through thefirst polarizing filter 217 in a direction toward the quantum dot sheet218 based on the arrangement of the liquid crystal molecules.

The first electrode 215 and the second electrode 213 may generate anelectrical field in the liquid crystal layer 214, and the liquid crystalmolecules in the liquid crystal layer 214 may be arranged in a straightline or a spiral shape based on the generated electrical field.

The quantum dot sheet 218 may be provided to convert the incident lightof a predetermined color, for example, blue-based light, into light of adifferent color, or may be provided to output the light withoutconversion to the different color. The quantum dot sheet 218 may includea light transmitter configured to transmit the blue-based light, atleast one red light quantum dot unit configured to convert the incidentblue-based light and emit red-based light, and at least one green lightquantum dot unit configured to convert the incident blue-based light andemit green-based light.

The light transmitter may emit a part of the incident light in adirection toward the second substrate 212 without a change of color, andthen emit another part in a direction toward the second substrate 212after conversion of the color. In particular, the light transmitter 118a may include a main body including light transmitting material and alight converting unit disposed in the main body, and in an exemplaryembodiment, the light transmitter 118 a may further include dispersionparticles disposed in the main body.

The light converting unit may change a color of the light incident ontothe main body and emit in a direction toward the second substrate 212.For example, when the incident light is blue-based light, the lightconverting unit may convert the blue-based light into green-based lightor red-based light and emit. In an exemplary embodiment, the lightconverting unit may include a green light converting unit configured toconvert the blue-based light into the green-based light, and here, thegreen light converting unit may be realized using at least one of thegreen quantum dot particle and the green fluorescent particle. The lightconverting unit may be omitted when the light converter is provided inthe light source 231.

Because the light transmitter may emit the blue-based light mixed with apart of green-based light based on the light converting unit, thedisplay apparatus 200 may have increased expression related to the bluecolor, and thus, color reproducibility of the display apparatus 200 maybe improved.

The dispersion particle may disperse the incident blue-based light, andemit in a direction toward the second substrate 212. The dispersionparticle may include zinc oxide, titanium oxide, silicon oxide, and/orthe like.

The red light quantum dot unit and the green light quantum dot unit mayconvert the color of the blue-based light, which is emitted in adirection toward the display panel 210 through the light guide plate232, using quantum dots, into red-based light or green-based light, andemit in the direction toward the second substrate 212.

A filtering part such as a blue light cut-off filter may be installed onthe red light quantum dot unit and the green light quantum dot unit. Thefiltering part may be installed on one surface of the red light quantumdot unit and the green light quantum dot unit in the forward direction,and may filter the blue-based light of the light emitted from the redlight quantum dot unit and the green light quantum unit.

The second substrate 212 may transmit the light emitted from the quantumdot sheet 218. The quantum dot sheet 218 may be installed on the secondsubstrate 212, and a filtering part may be further installed based onnecessity.

The second polarizing filter 211 may block or transmit a part of thered-based light, the green-based light, and the blue-based light emittedfrom the display panel 210. A polarizing axis of the second polarizingfilter 211 may be different from a polarizing axis of the firstpolarizing filter 217 provided between the light guide plate 232 and thedisplay panel 210, and in particular, both polarizing axes 240 and 269may be perpendicular to each other.

Hereinbefore, the second exemplary embodiment of the display apparatus200 is described, but various components may be added according to oneor more exemplary embodiments. For example, a touch screen panel may beadded to perform a touch operation related to the display apparatus 200,or an additional film may be installed and attached to the display panel210.

FIG. 28 is an exploded perspective view illustrating a third exemplaryembodiment of the display apparatus, and FIG. 29 is a sidecross-sectional view illustrating the third exemplary embodiment of thedisplay apparatus.

As illustrated in FIGS. 28 and 29, the display apparatus 300 includes,the front housing 301, the first substrate 340, electrodes 351 and 352,an OLED assembly 360, the second substrate 370, and the rear housing390. According to one or more exemplary embodiments, one or more ofthese components may be omitted.

The front housing 301 is disposed in the most forward direction of thedisplay apparatus 100, and the rear housing 390 is disposed in the mostrearward direction of the display apparatus 100, and both of them arecombined and form the exterior of the display apparatus 100.

The front housing 301 and the rear housing 390 include variouscomponents of the display apparatus 300 in the display apparatus 300,and may stably fix various components in the display apparatus 100 andprotect them from an external impact.

The front housing 301 may include a fixing part 303 forming a bezel, andthe side part 302 formed to extend in a direction of the rear housing390 from an end of the fixing parts 303. The side part 302 may becombined with the rear housing 390. An opening 304 may be defined by afront surface of the front housing 301.

The first substrate 340 is exposed to the outside in the forwarddirection, and an electrode 350 and the OLED assembly 360 are installedin the rearward direction thereof. Various optical sheets such as aprotection film, a polarizing film, and/or the like may be installed onone surface of the first substrate 340 in the forward direction.

The first substrate 340 may be formed of a transparent material so thatred-based light, green-based light, and blue-based light emitted fromthe OLED assembly 360 may pass therethrough. For example, the firstsubstrate 340 may be manufactured using a synthetic resin such as apolymethyl methacrylate resin, glass and/or the like.

The electrode 350 includes a first electrode 351 and a second electrode352, and the OLED assembly 360 is provided between the first electrode351 and the second electrode 352. The first electrode 351 and the secondelectrode 352 are electrically connected to an external electric powersource, and have a negative polarity or a positive polarity based on theexternal electric power. When the first electrode 351 and the secondelectrode 352 have the negative polarity or the positive polarity, acurrent flows through a light emitter 364 including a fluorescentorganic compound of the OLED assembly 360, and electrons are combinedwith holes in the light emitter 364, and thus, light is emitted.

The first electrode 351 may include a common electrode. The secondelectrode 352 may be provided to correspond to each light emitter 364.Thus, a plurality of second electrodes 352 may be provided based on thenumber of the light emitters 364.

At least one of the first electrode 351 and the second electrode 352 maybe formed with a metal thin film formed in aluminum, silver, magnesium,calcium, a combination thereof, and/or the like, and in addition to theabove, may be formed of indium tin oxide (ITO).

The OLED assembly 360 may include a light output part 362 configured tooutput light of a predetermined color and a substrate 361 on which thelight output part 362 is installed, and the light output part 362 mayinclude a color determination part 363 and a light emitter 364.

The light emitter 364 may receive electrons and holes based on thevoltage applied to the first electrode 351 and the second electrode 352,and may emit light based on the recombination of the received electronsand holes. In an exemplary embodiment, the light emitter 364 may includea blue phosphorescent unit configured to generate blue-based light.

Each of the light emitters 364, as illustrated in FIG. 29, may beinstalled to correspond to a red light quantum dot unit 363 r, a greenlight quantum dot unit 363 g, and a light transmitter 363 t of the colordetermination part 363. In other words, light generated from each of thelight emitters 364 may be incident onto the red light quantum dot unit363 r, the green light quantum dot unit 363 g, and the light transmitter363 t.

The color determination part 363 may convert the light of thepredetermined color emitted from the light emitter 364 into light of adifferent color or output without conversion into the light of differentcolor. The color determination part 363 may be provided to convert theblue-based light into red-based light or green-based light, or to emit apart of blue-based light without conversion.

In particular, the color determination part 363 may include at least onered light quantum dot unit 363 r configured to change the blue-basedlight and emit the red-based light, at least one green light quantum dotunit 363 g configured to change the blue-based light and emit thegreen-based light, and a light transmitter 363 t configured to transmitthe blue-based light.

The light transmitter 363 t may emit a part of blue-based light to theoutside without conversion, and change the remaining blue-based lightinto green-based light and emit the blue-based light with thegreen-based light. Also, the light transmitter 363 t may disperse andemit all or a part of the blue-based light.

The light transmitter 363 t may include a main body including a lighttransmitting material and at least one light converting unit 363 adispersed in the main body to convert the light of a predetermined colorinto light of a different color. In an exemplary embodiment, the lighttransmitter 363 t may further include dispersion particles 363 bdispersed in the main body.

The light converting unit 363 a may change a color of the light incidentonto the main body and emit in a direction toward the second substrate370. For example, when the light emitted from the light emitter 364 isblue-based light, the light converting unit 363 a may convert theblue-based light into green-based light or red-based light and emit. Inan exemplary embodiment, the light converting unit 363 a may include agreen light converting unit configured to convert the blue-based lightinto the green-based light, and the green light converting unit mayinclude at least one of the green quantum dot particle and the greenfluorescent particle. Because a part of green-based light is mixed withthe blue-based light emitted from the light transmitter 363 t by thelight converting unit 363 a, the display apparatus 300 may display theblue portion more precisely, and thus, color reproducibility of thedisplay apparatus 300 may be improved.

The dispersion particle 363 b may disperse incident light and emit inthe direction toward the second substrate 370. For example, when thelight emitted from the light emitter 364 is blue-based light, thedispersion particle 363 b may disperse the blue-based light and emit inthe direction toward the second substrate 370. The dispersion particlemay include zinc oxide, titanium oxide, silicon oxide, and/or the like.

The red light quantum dot unit 363 r, the green light quantum dot unit363 g, and the light transmitter 363 t are already described above, andthus, the detailed description thereof will be omitted.

In an exemplary embodiment, an emitting surface through which thered-based light or the green-based light of at least one of the redlight quantum dot unit 363 r and the green light quantum dot unit 363 gis emitted may be designed to be wider than an emitting surface throughwhich the blue-based light of the light transmitter 363 t is emitted. Inan exemplary embodiment, the OLED assembly 360 may include at least oneof the red light quantum dot units 363 r and the green light quantum dotunits 363 g in a relatively greater number than the light transmitters363 t.

The second electrode 352 may be installed on the second substrate 370,and various components configured to control various operations of thedisplay apparatus 100 may also be installed thereon. The variouscomponents installed on the second substrate 370 may include a processorand/or the like, and the processor may be realized by one or two or moresemiconductor chips and related components. The processor provided onthe second substrate 370 adjusts the application of electric power tothe first electrode 351 and the second electrode 352, and the lightoutput part 362 may emit the light.

Hereinbefore, the third exemplary embodiment of the display apparatus300 including the OLED is described, but additional various componentsmay be added. For example, a touch screen panel, a protection film, areflecting plate, a polarizing plate, and/or the like may be furtheradded in the display apparatus 300.

Exemplary embodiments have been shown and described above, however itwould be appreciated by those skilled in the art that changes may bemade to these exemplary embodiments without departing from theprinciples and spirit of the present disclosure, the scope of which isdefined in the claims and their equivalents.

What is claimed is:
 1. A display panel comprising: a light transmitterdisposed on a first pixel electrode; and a light converting unitdisposed on a second pixel electrode, wherein a portion of the lightconverting unit extends toward the light transmitter and covers a partof the first pixel electrode.
 2. The display panel of claim 1, whereinthe first pixel electrode is a blue pixel electrode; and wherein thesecond pixel electrode is a green pixel electrode.
 3. The display panelof claim 2, wherein the light transmitter comprises: a lighttransmitting material configured to transmit incident lighttherethrough; and dispersion particles distributed throughout the lighttransmitting material and configured to disperse the incident light. 4.The display panel of claim 2, wherein the light transmitter comprises: adye configured to absorb light other than blue light; and dispersionparticles configured to disperse incident light.
 5. The display panel ofclaim 2, wherein the light transmitter comprises: a dye configured toabsorb at least one among red light and green light; and dispersionparticles configured to disperse incident light.
 6. The display panel ofclaim 2, wherein the light converting unit comprises green light quantumdot particles configured to convert light incident on the lightconverting unit into green-based light.
 7. The display panel of claim 2,wherein the portion of the light converting unit is configured toconvert a portion of blue light incident on the blue pixel electrode togreen light, and wherein light incident on the blue pixel electrode isemitted as mixed blue light and green light.
 8. The display panel ofclaim 1, wherein a width of the light converting unit is 1 to 25%greater than a width of the first pixel electrode.
 9. The display panelof claim 1, wherein an area of the first pixel electrode covered by thelight converting unit is in a range of 1% to 25% of an area of the firstpixel electrode.
 10. The display panel of claim 3, wherein thedispersion particles comprise at least one among a zinc oxide, atitanium oxide, and a silicon oxide.
 11. The display panel of claim 3,wherein the light transmitting material includes at least one among anatural resin, a synthetic resin, and a glass.
 12. A display apparatuscomprising: a display panel comprising: a light transmitter disposed ona first pixel electrode; and a light converting unit disposed on asecond pixel electrode and the first pixel electrode configured toextend toward the light transmitter, and configured to cover a part ofthe first pixel electrode; and a light source configured to emit lighttoward the display panel.
 13. The display apparatus of claim 12, whereinthe first pixel electrode is a blue pixel electrode; and wherein thesecond pixel electrode is a green pixel electrode.
 14. The displayapparatus of claim 13, wherein the light transmitter comprises: a lighttransmitting material; and dispersion particles distributed throughoutthe light transmitting material and configured to disperse the incidentlight.
 15. The display apparatus of claim 13, wherein the lighttransmitter comprises: a dye configured to absorb light other than bluelight; and dispersion particles configured to disperse incident light.16. The display apparatus of claim 13, wherein the light transmittercomprises: a dye configured to absorb at least one among red light andgreen light; and dispersion particles configured to disperse incidentlight.
 17. The display apparatus of claim 13, wherein the lightconverting unit comprises green light quantum dot particles configuredto convert light incident on the light converting unit into green-basedlight.
 18. The display apparatus of claim 13, wherein a portion of thelight converting unit disposed on the blue pixel electrode is configuredto convert a portion of blue light incident on the blue pixel electrodeto green light, and wherein light incident on the blue pixel electrodeis emitted as mixed blue light and green light.
 19. The displayapparatus of claim 12, wherein a width of the light converting unit is 1to 25% greater than a width of the first pixel electrode.
 20. Thedisplay apparatus of claim 12, wherein an area of the first pixelelectrode covered by the light converting unit is in a range of 1% to25%.